From the first appearance, utterly delight one (8)
I believe the answer is:
Here is my best explanation:
'delight one' is the definition.
'entrance' can be an answer for 'delight' (thesaurus). I am not sure about the 'one' bit.
I don't understand how the rest of the clue works.
(Other definitions for entrance that I've seen before include "Right of admission", "doorway", "Cast a spell on", "An actor's coming on stage", "drawbridge?", "In transport", "Coming onto the stage", "charm", "Send" and "appearance".)