Feel concern about victory and winning share (5,2)
I believe the answer is:
carve up
'share' is the definition.
(thesaurus)
'feel concern about victory and winning' is the wordplay.
'feel concern' becomes 'care' ('care' can be a synonym of 'feel concern').
'about' means one lot of letters goes inside another.
'victory' becomes 'v'.
'and' means one lot of letters go next to another.
'winning' becomes 'up' (I've seen this in other clues).
'care' placed around 'v' is 'carve'.
'carve'+'up'='CARVE-UP'
(Other definitions for carve up that I've seen before include "Unfair distribution" , "share of the spoils" , "Sharing out of the spoils" , "unwarranted division?" , "divisive situation" .)