Crossword Genius

Old maestro taking cap off hole in device filming workers? (7)

Ross

I believe the answer is:

beecham

'old maestro' is the definition.
(conductor Thomas Beecham)

I don't understand the rest of the clue.

(Another definition for beecham that I've seen is " Sit Thomas --, C20 English conductor".)

I've seen this clue in The Guardian.
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