Stick together with Commanding Officer present (6)
I believe the answer is:
cohere
'stick together' is the definition.
(to cohere is to stick or fit together)
'with commanding officer present' is the wordplay.
'with' is a charade indicator (letters next to each other).
'commanding officer' becomes 'co'.
'present' becomes 'here' (both can mean in attendance).
'co'+'here' is 'COHERE'.
(Other definitions for cohere that I've seen before include "Stick firmly together" , "Be consistent" , "Form a whole" , "Even; without jerks" , "Hold firmly together" .)