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Who helps with setting leg and part of arm (9)

Ross

I believe the answer is:

stagehand

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'who helps with' is the definition.
I can't tell whether this definition defines the answer.

'leg and part of arm' is the wordplay.
'leg' becomes 'stage' (synonyms).
'and' means one lot of letters go next to another.
'part of arm' becomes 'hand' ('hand' is part of 'arm').
'stage'+'hand'='STAGEHAND'

'setting' is the link.

Can you help me to learn more?

(Other definitions for stagehand that I've seen before include "Person moving theatre props" , "Theatre worker" , "Theatrical props handler" , "Eg, sceneshifter" , "One may move flats" .)

I've seen this clue in The Times.
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