Crossword Genius

A groovy little diamond, perhaps (6)

Ross

I believe the answer is:

stylus

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But I can't explain it at all! Could you help me understand?

(Other definitions for stylus that I've seen before include "LP tracker" , "LP tracking point" , "One going on record" , "Pointed device on a record player" , "Device attached to the cartridge of a record player" .)

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