Scoffed feta at beano, regularly (5)
I believe the answer is:
eaten
'scoffed' is the definition.
(I've seen this before)
'feta at beano regularly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'feta'+'at'+'beano'='fetaatbeano'
The alternate letters of 'fetaatbeano' are 'EATEN'.
(Other definitions for eaten that I've seen before include "Put away" , "Got" , "Upset" , "Scoffed" , "used for food" .)