Caught in the drain, went off and it's bad (6)
I believe the answer is:
rancid
'it's bad' is the definition.
(I've seen this in another clue)
'caught in the drain went off' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'in' is an insertion indicator.
'went off' is an anagram indicator.
'drain' is an anagram of 'ranid'.
'c' put inside 'ranid' is 'RANCID'.
'and' is the link.
(Other definitions for rancid that I've seen before include "Smelling or tasting bad" , "Sour like stale grease 96)" , "Rank, high" , "Rotten; high" , "Rank-smelling." .)