There is a total of 1914 clues beginning with er
- Erstwhile science periodical
 - Erstwhile Secretary of Health and Human Services
 - Erstwhile Slav of E Germany
 - Erstwhile slugger for Connie Mack
 - Erstwhile sound systems
 - Erstwhile source of plumes
 - Erstwhile space station
 - Erstwhile speedsters
 - Erstwhile sports car
 - Erstwhile sporty car
 - Erstwhile spouses
 - Erstwhile spy org
 - Erstwhile Sri Lanka
 - Erstwhile SST destination
 - Erstwhile Steinem issue
 - Erstwhile stone tool
 - Erstwhile subordinate
 - Erstwhile summer job
 - Erstwhile synthetic wool
 - Erstwhile talk-show host
 - Erstwhile teen drama
 - Erstwhile telecom company
 - Erstwhile telethon org
 - Erstwhile theater chain
 - Erstwhile Tina Brown project
 - Erstwhile tool
 - Erstwhile toothpaste
 - Erstwhile trade grp
 - Erstwhile Treasury offerings
 - Erstwhile Turkish dignitaries
 - Erstwhile Turkish honorific
 - Erstwhile Turkish VIP
 - Erstwhile TV ministry
 - Erstwhile TV network
 - Erstwhile UK carrier
 - Erstwhile UK recording giant
 - Erstwhile US carrier
 - Erstwhile veep Morton
 - Erstwhile Vegas hotel
 - Erstwhile Venetian official
 - Erstwhile Ventura milieu
 - Erstwhile VHS rival
 - Erstwhile wanderer of the West
 - Erstwhile warship
 - Erstwhile wheels
 - Erstwhile White House letters
 - Erstwhile White House pet
 - Erstwhile writing implement
 - Erte forte
 - Erte's art
 - Erte's art style
 - Erte's forte
 - Erte's genre
 - Erte's genre, informally
 - Erte's style
 - Erte's style, for short
 - Erte's style, formally?
 - Ertegun who co-founded Atlantic Records
 - Erté’s style
 - Ertogrul's son
 - Erubescent
 - Erudite
 - Erudite folks
 - Erudite individual
 - Erudite individual
 - Erudite one
 - Erudite people
 - Erudite person
 - Erudite pests?
 - Erudite sort
 - Erudite type
 - Erudite via reading
 - Erudite
 - Erudite; learned
 - Erudition
 - Erudition
 - Erupt
 - Erupt forcibly
 - Erupt in anger
 - Erupt into applause, informally
 - Erupt suddenly
 - Erupt, as a volcano
 - Erupt, as Etna
 - Erupt, as fighting
 - Erupt, as Mt Tambora
 - Erupt, as tempers
 - Erupt
 - Erupt: Dial
 - Erupt?
 - Erupted
 - Erupted pollution
 - Erupted suddenly
 - Erupter at 32-Across
 - Erupter at least 140 times
 - Erupter in 1852
 - Erupter in 1983
 - Erupter in Sicily
 - Erupter of 1169
 - Erupter of 1669
 - Erupter of 1832