Crossword Genius

To stick together he must be in the centre (6)

Ross

I believe the answer is:

cohere

'to stick together' is the definition.
(to cohere is to stick or fit together)

'he must be in the centre' is the wordplay.
'must be in' is an insertion indicator.
'the centre' becomes 'core' (core can mean something's centre).
'he' going inside 'core' is 'COHERE'.

(Other definitions for cohere that I've seen before include "Fit together" , "Stick together, remain united" , "Be consistent" , "Fuse together" , "Hang together" .)

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