Caught pub returning seafood (4)
I believe the answer is:
crab
'seafood' is the definition.
(crab is a kind of seafood)
'caught pub returning' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'pub' becomes 'bar' (I've seen this before).
'returning' is a reversal indicator.
'bar' in reverse letter order is 'rab'.
'c'+'rab'='CRAB'
(Other definitions for crab that I've seen before include "Food from the sea" , "Sourpuss < to wreck" , "Nautical nipper" , "Decapod crustacean" , "A crustacean; type of apple" .)