A wish to be in company (5)
I believe the answer is:
along
'be in company' is the definition.
(I've seen this in another clue)
'a wish' is the wordplay.
'wish' becomes 'long' (I've seen this in other clues).
'a'+'long'='ALONG'
'to' acts as a link.
(Other definitions for along that I've seen before include "Beside - as groups often sing!" , "Sea monster, opposite Charybdis" , "Lengthwise" , "together" , "Throughout; onward" .)