Become enraged, but realise you must stop? (3,3)
I believe the answer is:
see red
'become enraged' is the definition.
(I've seen this in another clue)
'realise you must stop?' is the wordplay.
I cannot really see how this works, but
'realise' could be 'see' (synonyms) and 'see' is found within the answer.
The remaining letters 'red' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'but' acts as a link.
Can you help me to learn more?
(Other definitions for see red that I've seen before include "Lose temper colourfully, as bull does (3.3)" , "Burst a blood vessel" , "Be annoyed" , "Lose temper like angry bull" , "Lose temper like raging bull" .)