United supporters return, causing chaos as usual (5)
I believe the answer is:
snafu
'chaos as usual' is the definition.
I can't tell whether this defines the answer.
'united supporters return' is the wordplay.
'united' becomes 'u'.
'supporters' becomes 'fans' (fan is a kind of supporter).
'return' is a reversal indicator.
'u'+'fans'='ufans'
'ufans' backwards is 'SNAFU'.
'causing' acts as a link.
Can you help me to learn more?
(Other definitions for snafu that I've seen before include "Slangy acronym meaning in total confusion" , "Chaotic situation" , "Customary confusion" , "a mess of things" , "in a bad state" .)