Food from Jersey maybe, about to be taken from show (4)
I believe the answer is:
veal
'food from jersey maybe' is the definition.
(Jersey is a type of cow)
'about to be taken from show' is the wordplay.
'about' becomes 're' (regarding).
'to be taken from' suggests deleting specific letters.
'show' becomes 'reveal' (revealing is a kind of showing).
'reveal' with 're' taken out is 'VEAL'.
(Other definitions for veal that I've seen before include "cuisine" , "meat, R [ROSE] maybe" , "what the meat course may be" , "Type of meat" , "White meat" .)