Crossword Genius

One instrumental in taking up a collection? (5)

Ross

I believe the answer is:

cello

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

'one instrumental in' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'up a collection?' is the wordplay.
'CELLO' is hidden backwards within the letters.
But, I am uncertain how the hidden word is indicated.

'taking' acts as a link.

Can you help me to learn more?

(Other definitions for cello that I've seen before include "Viola's bigger brother?" , "has strings attached" , "Bass stringed instrument" , "String quartet instrument" , "It's bigger than a viola, but smaller than a double bass" .)

I've seen this clue in the Evening Standard.
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