Clinch, as a victory (3)
I believe the answer is:
ice
'clinch as a victory' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ice that I've seen before include "Precious stones" , "Do cake decoration" , "Some number" , "Frozen water; kill (slang)" , "Being feeble, can't cut any" .)