Usual chaos of university supporters getting upset (5)
I believe the answer is:
snafu
'usual chaos' is the definition.
'university supporters getting upset' is the wordplay.
'university' becomes 'u'.
'supporters' becomes 'fans' (fan is a kind of supporter).
'getting upset' shows that the letters should be reversed in order.
'u'+'fans'='ufans'
'ufans' reversed gives 'SNAFU'.
'of' acts as a link.
(Other definitions for snafu that I've seen before include "confused activity" , "a mess of things" , "Chaos (US slang)" , "Customary confusion" , "Chaotic situation" .)