Game pie without filling cook flipped with eggs (8)
I believe the answer is:
peekaboo
'game' is the definition.
(peekaboo is a kind of game)
'pie without filling cook flipped with eggs' is the wordplay.
'without filling' says to hollow out the word (remove centre letters).
'cook' becomes 'bake' (baking is a kind of cooking).
'flipped' says the letters should be written in reverse.
'with' says to put letters next to each other.
'eggs' becomes 'oo' (two O's - O looks like an egg).
'pie' with its centre taken out is 'pe'.
'bake' backwards is 'ekab'.
'pe'+'ekab'+'oo'='PEEKABOO'
(Other definitions for peekaboo that I've seen before include "Infants' hiding-and reappearing game" , "minor revelations" , "Peering-through-fingers game" , "Game played with young children" , "Childrens hiding game" .)