Stick with present company at first (6)
I believe the answer is:
cohere
'stick with' is the definition.
(I've seen this before)
'present company at first' is the wordplay.
'present' becomes 'here' (both can mean in attendance).
'company' becomes 'co' (abbreviation).
'at first' says to put letters next to each other.
'here' put after 'co' is 'COHERE'.
(Other definitions for cohere that I've seen before include "Be consistent" , "Cling" , "Fit together" , "Hold firmly together" , "Even; without jerks" .)