Crossword Genius

Instrument, one in a lather, according to Spooner (6,4)

Ross

I believe the answer is:

double bass

'instrument' is the definition.
(double bass is a kind of instrument)

I can't explain the remainder of the clue.

(Other definitions for double bass that I've seen before include "One taking a bow" , "Musical instrument" , "Low-pitched string instrument" , "Stringed instrument" , "... as part of orchestra" .)

I've seen this clue in The Guardian.
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