Change your mind when you regain consciousness (4,5)
I believe the answer is:
come round
'regain consciousness' is the definition.
(I've seen this before)
'change your mind when you' is the wordplay.
I cannot really understand how this works, but
'change' could be 'round' (rounding is a kind of changing) and 'round' is located in the answer.
'when' could be 'e' (I've seen this in other clues) and 'e' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for come round that I've seen before include "Recover consciousness" , "Finally agree" , "as someone who's been out may do" , "call" , "revived" .)