Charlie and Oscar, in this place, stick together (6)
I believe the answer is:
cohere
'stick together' is the definition.
(to cohere is to stick or fit together)
'charlie and oscar in this place' is the wordplay.
'charlie' becomes 'C' (phonetic alphabet).
'and' is a charade indicator (letters next to each other).
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'in this place' becomes 'here' (synonyms).
'c'+'o'+'here'='COHERE'
(Other definitions for cohere that I've seen before include "Hang together" , "Stick or hold together and resist separation" , "Stick firmly together" , "Hold firmly together" , "Fuse together" .)