Let off steam, cutting fervent educator (6)
I believe the answer is:
vented
'let off steam' is the definition.
(I've seen this in another clue)
'cutting fervent educator' is the wordplay.
'VENTED' is hidden in amongst the letters.
However, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for vented that I've seen before include "Supplied with outlet" , "Let (air/gas) out" , "Aired, gave outlet to - say anger" , "Discharged" , "Aired - say grievance or anger" .)