Dad’s at back, making something to eat (5)
I believe the answer is:
pasta
'something to eat' is the definition.
(pasta is a kind of food)
'dad's at back' is the wordplay.
'dad's' becomes 'pas' ('pa' can be a synonym of 'dad').
'back' is a reversal indicator.
'at' in reverse letter order is 'ta'.
'pas'+'ta'='PASTA'
'making' acts as a link.
(Other definitions for pasta that I've seen before include "Fare from Italy" , "Basis for serving" , "Dish of dough made with durum wheat" , "Tapas (anag)" , "Spaghetti, perhaps" .)