Insinuation made by union upset about result (8)
I believe the answer is:
innuendo
'insinuation' is the definition.
('innuendo' can be a synonym of 'insinuation')
'union upset about result' is the wordplay.
'upset' indicates an anagram.
'about' is an insertion indicator.
'result' becomes 'end' (I've seen this before).
'union' anagrammed gives 'innuo'.
'innuo' going around 'end' is 'INNUENDO'.
'made by' is the link.
(Other definitions for innuendo that I've seen before include "Undone in unpleasant insinuation" , "Indirect remark" , "suggestive remarks" , "Aspersion" , "suggested" .)