Uncouth, mostly noisy? This should be corrected (7)
I believe the answer is:
loutish
'uncouth' is the definition.
(I've seen this in another clue)
'mostly noisy? this should be corrected' is the wordplay.
'mostly' means to remove the last letter (most but not all of the word).
'noisy?' becomes 'loud' (associated in meaning).
'should be corrected' indicates an anagram.
'loud' with its last letter taken off is 'lou'.
'this' is an anagram of 'tish'.
'lou'+'tish'='LOUTISH'
(Other definitions for loutish that I've seen before include "Boorish" , "uncouth and aggressive" , "Ill-mannered and coarse, behaviour say" , "like a hooligan" .)