There is a total of 40594 clues beginning with so
- Source of inflation?
- Source of info for those on the go
- Source of information
- Source of information about 6-Down
- Source of information for Spider-Man, with "the"?
- Source of information for vacation planners
- Source of information leaked by Edward Snowden, for short
- Source of information
- Source of inscriptions on a kiswah
- Source of inside info, perhaps
- Source of inside info?
- Source of inside information
- Source of inside information?
- Source of inspiration
- Source of inspiration for Arthur Curry?
- Source of inspiration for Sir Isaac Newton, famously
- Source of inspiration
- Source of inspiration?
- Source of instant gratification?
- Source of intelligence
- Source of intelligence: Abbr
- Source of interest
- Source of interference
- Source of internal dialog?
- Source of Interstate info
- Source of intolerance
- Source of investor angst
- Source of invigoration
- Source of iodine
- Source of iodine
- Source of iridescent buttons
- Source of Irish breakfast tea, oddly
- Source of iron
- Source of iron or lead
- Source of irritation
- Source of isinglass
- Source of Islamic law
- Source of isotopes
- Source of Italian bubbly
- Source of ivory
- Source of ivory
- Source of J R Ewing's money
- Source of JM Smucker's success?
- Source of JP Morgan's fortune
- Source of Jane Addams' fame
- Source of Jed Clampett's wealth
- Source of joy in monotony
- Source of Julius's instinctive impulses?
- Source of jumbo eggs
- Source of jumbo eggs, in brief
- Source of karakul, astrakhan, broadtail, etc
- Source of Kentucky blue
- Source of kerosene
- Source of kerosene and paraffin
- Source of ketose
- Source of khaki?
- Source of King Solomon's gold
- Source of knocking
- Source of knopper
- Source of knowledge
- Source of Kremlin news
- Source of lacquer, varnish or tannin
- Source of lacquer, varnish, or tannin
- Source of lanolin
- Source of late election returns, with "the"
- Source of latex
- Source of laughs at the end of a comedy?
- Source of lava
- Source of laws
- Source of lead
- Source of lead or iron
- Source of leaks
- Source of lean meat
- Source of lean red meat
- Source of learning?
- Source of lecithin
- Source of lees
- Source of legal precedent
- Source of legal precedents
- Source of lemon zest
- Source of lemons
- Source of lemons, sometimes
- Source of leucite and rhyolite
- Source of licorice-flavored oil
- Source of life, some say (3, 4, 13)
- Source of life?
- Source of light
- Source of light meat
- Source of light
- Source of Lincoln's indebtedness
- Source of linen
- Source of linen
- Source of linseed oil
- Source of linseed oil
- Source of Liquid Paper?
- Source of litmus
- Source of little squirts in "The Wizard of Oz"
- Source of livestock feed
- Source of local information
- Source of long-playing musical