A couple of pages allowed access to one cocktail (9)

I believe the answer is:

appletini

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

'a couple of pages allowed access to one' is the wordplay.
'couple of' says to double the letters.
'pages' becomes 'p'.
'allowed access' becomes 'letin' (I can't justify this - if you can you should believe this answer much more).
'to one' becomes 'i' (Roman numeral).
'p' duplicated is 'pp'.
'a'+'pp'+'letin'+'i'='APPLETINI'

Can you help me to learn more?

(Another definition for appletini that I've seen is " Cocktail".)

I've seen this clue in The Daily Express.

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