Saint not enthusiastic to criticise (5)
I believe the answer is:
scold
'criticise' is the definition.
(scolding is a kind of criticizing)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for scold that I've seen before include "Chide or reprimand" , "Upbraid" , "Chide, rebuke" , "Chide - fishwife" , "quarrelsome woman of old?" .)