After flipping immense pan, a chef's holding appetisers (7)
I believe the answer is:
canapes
'appetisers' is the definition.
(I've seen this before)
'after flipping immense pan a chef's holding' is the wordplay.
'after flipping' is a reversal indicator.
'holding' indicates the answer is hidden within the clue.
'sepanac' is hidden within 'immense pan a chefs'.
'sepanac' backwards is 'CANAPES'.
(Other definitions for canapes that I've seen before include "Small party eats" , "for the party buffet" , "Savoury spreads on bread or toast as appetizer" , "Appetisers" , "food for party" .)