Critical comment about Scottish island – no end to that uproar (6)
I believe the answer is:
tumult
'that uproar' is the definition.
(synonyms)
'critical comment about scottish island no end' is the wordplay.
'critical comment' becomes 'tut' (expression of disapproval).
'about' indicates putting letters inside.
'scottish island' becomes 'mull' (Isle of Mull).
'no end' means to remove the last letter.
'mull' with its final letter removed is 'mul'.
'tut' going around 'mul' is 'TUMULT'.
'to' is the link.
(Other definitions for tumult that I've seen before include "Loud confused noise" , "A lot of noise, uproar" , "Noisy commotion" , "A lot of noise and commotion" , "State of confusion and agitation, uproar" .)