Bowing is required during Elgar concerto (4)

I believe the answer is:

arco

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'bowing is' is the definition.
I can't judge whether this defines the answer.

'during elgar concerto' is the wordplay.
'during' indicates the answer is hidden within the clue.
'ARCO' can be found hidden inside 'elgar concerto'.

'required' is the link.

Can you help me to learn more?

(Other definitions for arco that I've seen before include "Played with the bow" , "Musical direction" , "bow for players" , "which every violinist must grasp" , "taking a bow" .)

I've seen this clue in The Guardian.

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