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Dust it and French polish half of two-man show (8)

Ross

I believe the answer is:

duettist

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

'show' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'dust it and french polish half of two-man' is the wordplay.
I cannot quite understand how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
'two' could be 'duet' (duet is a kind of two) and 'duet' is located in the answer.
The remaining letters 'ist' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for duettist that I've seen before include "One who plays or sings with another" , "Player with partner" .)

I've seen this clue in The Globe and Mail.
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