Second rotten reprimand (4,3)
I believe the answer is:
tick off
'reprimand' is the definition.
(I've seen this before)
'second rotten' is the wordplay.
'second' becomes 'tick' (both can mean a very short amount of time).
'rotten' becomes 'off' (rotten food is 'off').
'tick'+'off'='TICK OFF'
(Other definitions for tick off that I've seen before include "Indicate checking" , "Check through a list - reprimand" , "Lecture - record attendance" , "Scold" , "Put mark on" .)