Tip for winning finale (5)
I believe the answer is:
upend
'tip' is the definition.
(I've seen this before)
'winning finale' is the wordplay.
'winning' becomes 'up' (eg being up at half time in football).
'finale' becomes 'end' (the end of a story or show).
'up'+'end'='UPEND'
'for' acts as a link.
(Other definitions for upend that I've seen before include "Topple" , "Overturn" , "Put into disarray" , "Invert" , "Alter greatly" .)