Grabbing glimpse of decisive victory, punch cheat (8)
I believe the answer is:
hoodwink
'cheat' is the definition.
(I know that hoodwink is a more specific form of cheat)
'grabbing glimpse of decisive victory punch' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is found within the answer.
'victory' could be 'win' (a win is a victory) and 'win' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for hoodwink that I've seen before include "Deceive, fool" , "Deceive, trick" , "Put wool over eyes of" , "Delude" , "Deceive - cheat" .)