Be united with company present (6)
I believe the answer is:
cohere
'be united' is the definition.
(I've seen this in another clue)
'with company present' is the wordplay.
'with' is a charade indicator (letters next to each other).
'company' becomes 'co' (abbreviation).
'present' becomes 'here' (both can mean in attendance).
'co'+'here' is 'COHERE'.
(Other definitions for cohere that I've seen before include "Fuse together" , "Even; without jerks" , "Fit together" , "Stick together, remain united" , "Form a whole" .)