Fool, a silly sausage for starters (3)
I believe the answer is:
ass
'fool' is the definition.
(ass is a kind of fool)
'a silly sausage for starters' is the wordplay.
'for starters' suggests taking the first letters.
The initial letters of 'silly sausage' is 'ss'.
'a'+'ss'='ASS'
(Other definitions for ass that I've seen before include "Nincompoop" , "Braying animal" , "Horse relative" , "Small hoofed animal" , "Donkey or foolish person" .)