There is a total of 359 clues beginning with ef
- Ef counterpart, in temperatures
 - Ef, eg
 - EF5 event
 - Eff up
 - Efface
 - Efface, with "off"
 - Efface
 - Effaced
 - Effaced
 - Effacement
 - Effacement
 - Effacements
 - Effacements
 - Effaces
 - Effacing
 - Effect
 - Effect a cure
 - Effect a delay
 - Effect a demotion?
 - Effect a makeover
 - Effect as an agent
 - Effect created by a guitar pedal, informally
 - Effect in a tunnel
 - Effect in the recording studio
 - Effect of a love potion
 - Effect of a sac fly
 - Effect of a serious earthquake on the Golden Gate?
 - Effect of a weak TV signal
 - Effect of a yodel, perhaps
 - Effect of age and gravity on various body parts?
 - Effect of atomic energy release
 - Effect of auto exhaust
 - Effect of cold seats?
 - Effect of downgraded credit on a potential home buyer?
 - Effect of fast bow action
 - Effect of glacial movement
 - Effect of gravity?
 - Effect of laryngitis on "The Nanny" star?
 - Effect of lunar gravity
 - Effect of one sound throughout piece
 - Effect of past experience
 - Effect of Pepé Le Pew battling a romantic rival?
 - Effect of secondhand pot smoke
 - Effect of surplus oil
 - Effect of the moon's gravity
 - Effect of tightening an extra-tight belt, maybe
 - Effect of time
 - Effect of wind, perhaps
 - Effect of yeast on dough
 - Effect preceder
 - Effect produced by the difference in adjacent hues
 - Effect producer
 - Effect thrift
 - Effect used during coaches challenges
 - Effect used in 72 Down
 - Effect used to measure astronomical distances
 - Effect's beginning
 - Effect's beginning?
 - Effect's counterpart
 - Effect's mate
 - Effect's partner
 - Effect's precursor
 - Effect's trigger
 - Effect, as a law
 - Effect, or effect's partner
 - Effect
 - Effect; use
 - Effected a delay in an action
 - Effected by force
 - Effected in secret
 - Effected, in a bad way
 - Effected
 - Effecting a release
 - Effective
 - Effective action
 - Effective banes
 - Effective control
 - Effective cooperation
 - Effective date in law
 - Effective deal maker
 - Effective figure used to compare interest plans
 - Effective for hours
 - Effective force
 - Effective force
 - Effective garden soil
 - Effective immediately
 - Effective input
 - Effective insult, in slang
 - Effective items in interior decoration
 - Effective leveler
 - Effective lines in "Strange Interlude"
 - Effective logisticians
 - Effective means of enforcement
 - Effective means of enforcement
 - Effective musical quaver
 - Effective now, as a law
 - Effective on
 - Effective pain treatment for some
 - Effective people
 - Effective power