Eggs sent up: not exactly party food (7)
I believe the answer is:
avocado
'food' is the definition.
(avocado is a kind of food)
'eggs sent up not exactly party' is the wordplay.
'eggs' becomes 'ova' (I've seen this before).
'sent up' says the letters should be written backwards.
'not exactly' becomes 'ca' (circa).
'party' becomes 'do' (do is a kind of party).
'ova' written backwards gives 'avo'.
'avo'+'ca'+'do'='AVOCADO'
(Other definitions for avocado that I've seen before include "Tropical salad ingredient" , "Are mostly outspoken party getting" , "Fruit with large stone" , "slightly green" , "Heavily stoned fruit" .)