Tight garment that you must wear for fight (8)
I believe the answer is:
argument
'for fight' is the definition.
(thesaurus)
'tight garment that you' is the wordplay.
'tight' is an anagram indicator (tight can mean drunk).
'that you' becomes 'u' (I've seen this in other clues).
'garment'+'u'='garmentu'
'garmentu' with letters rearranged gives 'ARGUMENT'.
'must wear' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
(Other definitions for argument that I've seen before include "Line of reasoning" , "Heated debate" , "that may be constructed on premises" , "Opposed points of view" , "Contentious debate" .)