Maiden in Bankside butcher's (5)

I believe the answer is:

debut

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

'maiden' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'in bankside butcher's' is the wordplay.
'in' indicates a hidden word.
'DEBUT' can be found hidden inside 'bankside butchers'.

Can you help me to learn more?

(Other definitions for debut that I've seen before include "First appearance, a coming-out" , "First attempt" , "Start -- launch" , "entrance" , "Beginning, first performance" .)

I've seen this clue in The Sun.

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