Crossword Genius

Union workers (7)

Ross

I believe the answer is:

welders

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

'union workers' is the definition.
'welders' can be an answer for 'workers' (welder is a kind of worker). I'm not sure about the 'union' bit.

'workers' is the wordplay.
I cannot quite understand how this works, but
'workers' could be 'elders' (elder is a kind of worker) and 'elders' is found in the answer.
A single letter 'w' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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