Stick with firm at this point (6)

I believe the answer is:

cohere

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'stick with' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for cohere that I've seen before include "Be consistent" , "Fit together" , "Hang together" , "Stick firmly together" , "Form a whole" .)

I've seen this clue in The Sun.

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