Some cheat in gastropub having a meal (6)
I believe the answer is:
eating
'having a meal' is the definition.
(I've seen this in another clue)
'some cheat in gastropub' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'EATING' is hidden within 'cheat in gastropub'.
(Other definitions for eating that I've seen before include "Taking in solid food" , "Putting away" , "Having supper?" , "Ingestion" , "at breakfast?" .)