Sound of music coming from orchestra inside (6)

I believe the answer is:

strain

'sound of music' is the definition.
(strain can mean a piece of music)

'coming from orchestra inside' is the wordplay.
'coming from' indicates the answer is hidden within the clue.
'STRAIN' is hidden within 'orchestra inside'.

(Other definitions for strain that I've seen before include "Violent effort" , "Drain off" , "Sieve; breed" , "Pass through a colander" , "Family - stress - air - force" .)

I've seen this clue in The Guardian.

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