An admission to charm one (8)
I believe the answer is:
entrance
This clue might be a double definition.
'an admission' is the first definition.
(I've seen this in another clue)
'charm one' is the second definition.
'entrance' can be an answer for 'charm' (entrance can mean to charm or bewitch). I am not certain of the 'one' bit.
'to' is the link.
Can you help me to learn more?
(Other definitions for entrance that I've seen before include "Capture" , "Means or place of going in" , "Charm, delight" , "seventeen [POSTERN], perhaps" , "Way in - fascinate" .)