Crossword Genius

Joint contribution advanced by a group (5)

Ross

I believe the answer is:

tenon

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'joint' is the definition.
(I've seen this in other clues)

I can't explain the remainder of the clue.

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(Other definitions for tenon that I've seen before include "Tongue of wood for joint" , "Mortise extension" , "Mortise counterpart" , "Projection (joins with mortise)" , "Join" .)

I've seen this clue in the Evening Standard.
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