Crossword Genius

Collectable item interesting to us (5)

Ross

I believe the answer is:

curio

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'collectable' is the definition.
(I know that collectable can be written as curio)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for curio that I've seen before include "Rare thing sought for collection" , "Something unusual, perhaps worthy of collecting" , "Intriguing object worth collecting" , "Small fascinating collectible object" , "Unusual object, oddity" .)

I've seen this clue in the Evening Standard.
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