Pin-up about to tuck into a lot of raw food (5,4)

'food' is the definition.
(angel cake is a kind of food)

'pin-up about to tuck into a lot of raw' is the wordplay.
'pin-up' becomes 'gel' ('leg' backwards - 'pin' can mean a leg).
'about' becomes 'c' (abbreviation for circa).
'to tuck into' indicates putting letters inside.
'lot of' means to remove the last letter (a lot of the word but not all of it).
'raw' becomes 'naked' (raw can mean naked or uncovered).
'gel'+'c'='gelc'
'naked' with its last letter taken away is 'nake'.
'a'+'nake'='anake'
'gelc' put inside 'anake' is 'ANGEL-CAKE'.