Fish for each companion (5)
I believe the answer is:
perch
'fish' is the definition.
(perch is a kind of fish)
'each companion' is the wordplay.
'each' becomes 'per'.
'companion' becomes 'ch' (I've seen this in other clues).
'per'+'ch'='PERCH'
'for' is the link.
(Other definitions for perch that I've seen before include "Roosting place" , "old measure of land" , "Bird's resting place or old measure of length" , "Bird's seat - fish" , "Rod on which bird roosts" .)