Hid lager cocktail from a top pupil (4,4)

I believe the answer is:

head girl

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'a top pupil' is the definition.
'head girl' can be an answer for 'pupil' (I've seen this before). I am not sure about the 'a top' bit.

'hid lager cocktail' is the wordplay.
'cocktail' is an anagram indicator.
'hid'+'lager'='hidlager'
'hidlager' with letters rearranged gives 'HEAD GIRL'.

'from' acts as a link.

Can you help me to learn more?

(Other definitions for head girl that I've seen before include "Senior pupil" , "Senior prefect" , "promoted student" .)

I've seen this clue in the Evening Standard.

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