Gay guy's first in for drink (4,3)

I believe the answer is:

pink gin

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

'gay guy's first in' is the wordplay.
'gay' becomes 'pink' (I can't justify this - if you can you should believe this answer much more).
'guy's first' becomes 'g' (pst letter of 'guy').
'pink'+'g'+'in'='PINK GIN'

'for' is the link.

Can you help me to learn more?

(Other definitions for pink gin that I've seen before include "Drink with angostura bitters" , "Angostura-flavoured drink" , "Geneva and bitters" , "Alcoholic drink" , "Drink with 9" .)

I've seen this clue in The Sun.

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