Companion, a pilot, chewed a sausage (9)
I believe the answer is:
chipolata
'sausage' is the definition.
(I've seen this before)
'companion a pilot chewed a' is the wordplay.
'companion' becomes 'ch' (I've seen this in other clues).
'chewed' indicates an anagram.
'a'+'pilot'='apilot'
'apilot' is an anagram of 'ipolat'.
'ch'+'ipolat'+'a'='CHIPOLATA'
(Other definitions for chipolata that I've seen before include "Small thin sausage" , "Type of sausage" , "Party snack" , "banger" .)