Retain what might have been won (3)
I believe the answer is:
'retain' is the definition.
(I've seen this in another clue)
'might have been won' is the wordplay.
'won' can be anagrammed to 'OWN'.
However, I am not sure how this is indicated.
'what' is the link.
Can you help me to learn more?
(Other definitions for own that I've seen before include "Posses" , "Personal; possess" , "Possess - recognise - admit" , "Allow" , "Be in legal possession of (3)" .)