A drink for Judy's companion (5)

I believe the answer is:

punch

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'a drink' is the definition.
(punch is an alcoholic drink)

'judy's companion' is the wordplay.
'judy' becomes 'pun' (I can't explain this - if you can you should believe this answer much more).
'companion' becomes 'ch' (Companion of Honour).
'pun'+'ch'='PUNCH'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for punch that I've seen before include "Press" , "Sock" , "Hit - party drink" , "Slug - mixed drink" , "Strike, Judy's husband" .)

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