Rotten Row (4)
I believe the answer is:
rank
I believe this clue is a double definition.
'rotten' is the first definition.
(I've seen this before)
'row' is the second definition.
(thesaurus)
(Other definitions for rank that I've seen before include "Not qualified to give order" , "Very undesirable" , "Row of people standing abreast" , "(Taxi) stand" , "Coarse; tier" .)