Crossword Genius

Saw inside, playing the piano (5)

Ross

I believe the answer is:

spied

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'saw' is the definition.
(to spy is to see or observe)

I can't explain the rest of the clue.

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(Other definitions for spied that I've seen before include "Saw" , "Was a secret agent" , "Spotted" , "Caught sight of" , "Noticed" .)

I've seen this clue in the Evening Standard.
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