Singular bravery - not a source of suffering! (7)
I believe the answer is:
scourge
'source of suffering' is the definition.
'scourge' can be an answer for 'source' (I have seen 'source of evil' mean 'scourge' so perhaps 'source' could also mean 'scourge'). I am unsure of the 'of suffering' bit.
'singular bravery not a' is the wordplay.
'singular' becomes 's' (abbreviation in grammar).
'bravery' becomes 'courage' (synonyms).
'not' indicates named letters should be taken away.
'courage' with 'a' taken out is 'courge'.
's'+'courge'='SCOURGE'
Can you help me to learn more?
(Other definitions for scourge that I've seen before include "source of evil" , "Whip; agent of suffering" , "big nuisance" , "Whip; source of suffering" , "Whip - bane" .)