Chap that reinvented a new drink (9)
I believe the answer is:
manhattan
'drink' is the definition.
(manhattan is a kind of drink)
'chap that reinvented a new' is the wordplay.
'chap' becomes 'man' (I've seen this before).
'reinvented' is an anagram indicator.
'a new' becomes 'an' (I've seen this in other clues).
'that' is an anagram of 'hatt'.
'man'+'hatt'+'an'='MANHATTAN'
(Other definitions for manhattan that I've seen before include "Cocktail consisting of whisky, vermouth and bitters" , "Vermouth and whisky cocktail - New York borough" , "NY borough" , "area of New York City" , "intoxicating drink" .)