From the first appearance, utterly delight one (8)

I believe the answer is:

entrance

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'delight one' is the definition.
'entrance' can be an answer for 'delight' (thesaurus). I am not certain of the 'one' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for entrance that I've seen before include "Vestibule" , "Maybe drive" , "arrival" , "Send" , "Cast a spell on" .)

I've seen this clue in the Evening Standard.

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