Dress a start in audition? (5)

I believe the answer is:

adorn

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'dress' is the definition.
(I've seen this before)

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

(Other definitions for adorn that I've seen before include "Improve appearance" , "Festoon" , "dress" , "Embellish, decorate" , "Attire" .)

I've seen this clue in The Guardian.

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