Is involved in one dreadful row (5)
I believe the answer is:
noise
'row' is the definition.
(I've seen this before)
'is involved in one dreadful' is the wordplay.
'involved in' means one lot of letters goes inside another.
'dreadful' indicates anagramming the letters.
'one' is an anagram of 'noe'.
'is' put inside 'noe' is 'NOISE'.
(Other definitions for noise that I've seen before include "Loud sound; bruit" , "Din, cacophony" , "Unstructured sound" , "Loud or unpleasant sound" , "interference" .)