Moving stair that makes a musical sound (5)

I believe the answer is:

sitar

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'a musical sound' is the definition.
I know that 'musical' relates to this answer. I also know that both the answer and definition are singular nouns

'moving stair' is the wordplay.
'moving' indicates anagramming the letters.
'stair' anagrammed gives 'SITAR'.

'that makes' acts as a link.

Can you help me to learn more?

(Other definitions for sitar that I've seen before include "Indian stringed instrument" , "Long necked and often plucked" , "Astir with Indian long-necked lute" , "Long-necked musical instrument of India" , "Stringed instrument of the subcontinent" .)

I've seen this clue in the Evening Standard.

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