Offensive row (4)
I believe the answer is:
rank
I believe this clue is a double definition.
'offensive' is the first definition.
(similar in meaning)
'row' is the second definition.
(I've seen this before)
(Other definitions for rank that I've seen before include "Stinking" , "Noisome" , "Excessive" , "Standing; foul smelling" , "Utter" .)