Sticking together, somehow chose one victory (8)
I believe the answer is:
cohesive
'sticking together' is the definition.
(I've seen this before)
'somehow chose one victory' is the wordplay.
'somehow' indicates an anagram.
'one' becomes 'i' (Roman numeral).
'victory' becomes 'VE' (VE is short for Victory in Europe).
'chose' anagrammed gives 'cohes'.
'cohes'+'i'+'ve'='COHESIVE'
(Other definitions for cohesive that I've seen before include "All together, holding" , "United" , "Sticking together" , "Tending to stick together" .)