Instrument that could be a collector's piece (5)

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)

'could be a collector's piece' is the wordplay.
'CELLO' is hidden backwards in amongst the letters.
But, I'm unsure how the hidden word is indicated.

'that' acts as a link.

Can you help me to learn more?

(Other definitions for cello that I've seen before include "Jacqueline du Pre's instrument" , "Casals' instrument" , "Large stringed instrument" , "Bowed musical instrument" , "Played by Rostropovich" .)

I've seen this clue in the Evening Standard.

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