Critical comment about origins of Manchester United likely to produce uproar (6)
I believe the answer is:
tumult
'uproar' is the definition.
(synonyms)
'critical comment about origins of manchester united likely' is the wordplay.
'critical comment' becomes 'tut' (expression of disapproval).
'about' is an insertion indicator.
'origins of' indicates taking the first letters.
The first letters of 'manchester united likely' is 'mul'.
'tut' enclosing 'mul' is 'TUMULT'.
'to produce' is the link.
(Other definitions for tumult that I've seen before include "A lot of noise and shouting" , "Uproar, noisy disturbance" , "Uproar; riot" , "Commotion, turmoil" , "State of confusion and agitation, uproar" .)