Carpenter likely to become a union member? (6)
I believe the answer is:
joiner
This clue could be a double definition.
'carpenter likely' is the first definition.
'joiner' can be an answer for 'carpenter' (I've seen this in another clue). I'm unsure of the 'likely' bit.
'a union member?' is the second definition.
'joiner' can be an answer for 'member?' (joiner is a kind of member). I'm not certain of the 'a union' bit.
'to become' acts as a link.
Can you help me to learn more?
(Other definitions for joiner that I've seen before include "Tradesman who makes house fittings and other woodworks" , "Person who makes finished woodwork" , "Saw user maybe" , "Carpenter" , "One eager to belong; woodworker" .)