Crossword Genius

Chef James needs one drink (7)

Ross

I believe the answer is:

martini

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'drink' is the definition.
(I know this)

'chef james needs one' is the wordplay.
'chef james' becomes 'martin' (I can't explain this - if you can you should believe this answer much more).
'needs' 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 "Italian drink" , "alcoholic drink" , "Type of Italian vermouth" , "rifle" , "Cocktail made with gin or vodka and vermouth" .)

I've seen this clue in The Sun.
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