Crossword Genius

Craftsman unlikely to refuse union membership? (6)

Ross

I believe the answer is:

joiner

I'm a little stuck... Click here to teach me more about this clue!

'craftsman' is the definition.
(I know that joiner is a type of woodworker)

'unlikely to refuse union membership?' is the wordplay.
I cannot quite understand how this works, but
'union' could be 'join' (synonyms) and 'join' is found in the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for joiner that I've seen before include "Person constructing stairs, doors, window frames etc" , "always ready to sign up?" , "Person who makes furniture and other woodwork" , "Skilled woodworker" , "Saw user maybe" .)

I've seen this clue in The Guardian.
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