Opportunity with a period of boxing for reversal of fortune (10)
I believe the answer is:
turnaround
'reversal of fortune' is the definition.
'turnaround' can be an answer for 'reversal' (synonyms). I'm unsure of the 'of fortune' bit.
'opportunity with a period of boxing' is the wordplay.
I cannot really understand how this works, but
'a' is present in the answer.
'period' could be 'round' (round is a kind of period) and 'round' is found within the answer.
The remaining letters 'turn' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'for' acts as a link.
Can you help me to learn more?
(Another definition for turnaround that I've seen is " Unexpected change".)