Only crack when victor departs (4)
I believe the answer is:
sole
'only' is the definition.
(synonyms)
'crack when victor departs' is the wordplay.
I cannot quite understand how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is found in the answer.
The remaining letters 'sol' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for sole that I've seen before include "Unique" , "Fish - alone" , "Bottom of the foot" , "A lone sort of fish - lose it" , "fish in the sea!" .)