A graduate has drink in flask (7)

I believe the answer is:

ampulla

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'flask' is the definition.
(ampulla is a kind of flask)

'a graduate has drink' is the wordplay.
'graduate' becomes 'ma' (abbreviation for Master of Arts).
'has' is an insertion indicator.
'drink' becomes 'pull' (I can't justify this - if you can you should give a lot more credence to this answer).
'ma' placed around 'pull' is 'mpulla'.
'a'+'mpulla'='AMPULLA'

'in' is the link.

Can you help me to learn more?

(Other definitions for ampulla that I've seen before include "Ancient Roman flask" , "Sacred vessel" , "Container for wine and water in church" .)

I've seen this clue in The Telegraph.

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