Theatre food is tasted again (7)
I believe the answer is:
repeats
'is tasted again' is the definition.
(as in food repeating on you)
'theatre food' is the wordplay.
'theatre' becomes 'rep' (I've seen this before).
'food' becomes 'eats' (eats is a kind of food).
'rep'+'eats'='REPEATS'
(Other definitions for repeats that I've seen before include "Says again" , "Duplicates" , "States again" , "Echoes" , "Performs again" .)