Prepared to push for a result (6)
I believe the answer is:
upshot
'for a result' is the definition.
('upshot' can be a synonym of 'result')
'prepared to push' is the wordplay.
'prepared' is an anagram indicator.
'to'+'push'='topush'
'topush' anagrammed gives 'UPSHOT'.
(Other definitions for upshot that I've seen before include "Outcome, final result" , "One killed the albatross" , "issue" , "skier" , "Outcome, consequence" .)