Opportunity to finish in concert (5)

I believe the answer is:

unity

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

'concert' is the definition.
(concert can mean agreement or unity)

'opportunity to finish' is the wordplay.
'UNITY' is hidden within the letters.
However, I am not sure how the hidden word is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for unity that I've seen before include "One of the Mitfords" , "Concord" , "A single whole" , "Oneness, harmony" , "Solidarity" .)

I've seen this clue in the Evening Standard.

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