Crossword Genius

Servant that developed a new cocktail (9)

Ross

I believe the answer is:

manhattan

'cocktail' is the definition.
(I know that Manhattan is a type of cocktail)

'servant that developed a new' is the wordplay.
'servant' becomes 'man' (man is a kind of servant).
'developed' indicates an anagram.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'that' with letters rearranged gives 'hatt'.
'man'+'hatt'+'a'+'n'='MANHATTAN'

(Other definitions for manhattan that I've seen before include "Island of New York - cocktail" , "Vermouth and whisky cocktail - New York borough" , "Cocktail consisting of whisky, vermouth and bitters" , "Vermouth and whiskey, with a dash of bitters" , "New York City borough" .)

I've seen this clue in The Independent.
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