The way in which one may charm (8)

I believe the answer is:

entrance

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'the way in' is the definition.
(I've seen this in another clue)

'one may charm' is the wordplay.
'one may' becomes 'en' (I can't explain this - if you can you should believe this answer much more).
'charm' becomes 'trance' (synonyms).
'en'+'trance'='ENTRANCE'

'which' is the link.

Can you help me to learn more?

(Other definitions for entrance that I've seen before include "doorway" , "Send" , "Bowl over" , "Gate" , "Fill with wonder, door" .)

I've seen this clue in The Irish News.

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