Crossword Genius

One pushing for union member­ship expected to bend the knee (8)

Ross

I believe the answer is:

proposer

'one pushing for union membership expected to bend the knee' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'one pushing for' is the wordplay.
I cannot quite understand how this works, but
'for' could be 'pro' (as in being 'pro' something) and 'pro' is present in the answer.
The remaining letters 'poser' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

(Other definitions for proposer that I've seen before include "One introducing motion" , "Advocate" , "One hopes to be engaged" , "he asks for a hand" , "One putting forward motion" .)

I've seen this clue in The Guardian.
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