In company (with others) (5)
I believe the answer is:
along
'in company with others' is the definition.
(along with others)
This is all the clue.
(Other definitions for along that I've seen before include "Forward - in a line" , "Moving in a constant direction on (something)" , "With a forward motion: in accompaniment" , "Lengthwise" , "Beside - as groups often sing!" .)