Crossword Genius

Instrument, possible collector's piece (5)

Ross

I believe the answer is:

cello

I'm a little stuck... Click here to teach me more about this clue!

'instrument' is the definition.
(cello is a kind of instrument)

'possible collector's piece' is the wordplay.
'CELLO' is hidden backwards within the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for cello that I've seen before include "String quartet instrument" , "Bass stringed instrument" , "Tortelier's instrument" , "Musical instrument like large violin held between knees" , "Casals' instrument" .)

I've seen this clue in the Evening Standard.
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