Crossword Genius

Name of chap with one drink (7)

Ross

I believe the answer is:

martini

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'drink' is the definition.
(martini is a kind of drink)

'name of chap with one' is the wordplay.
'name of chap' becomes 'martin' (I can't explain this - if you can you should believe this answer much more).
'with' means one lot of letters go next to another.
'one' becomes 'i' (Roman numeral).
'martin'+'i'='MARTINI'

Can you help me to learn more?

(Other definitions for martini that I've seen before include "Sienese painter" , "Cocktail of gin and dry vermouth" , "obtained from a bottle" , "In glass, one's dry" , "rifle" .)

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