Knock back some gin (or generous cocktail that requires it!) (7)

I believe the answer is:

negroni

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'cocktail that requires it' is the definition.
'Negroni' can be an answer for 'cocktail' (I know this). I'm not sure about the remainder of the definition.

'knock back some gin or generous' is the wordplay.
'knock back' is a reversal indicator.
'some' indicates a hidden word (some of the parts of the word are used).
'inorgen' is hidden in the letters of 'gin or generous'.
'inorgen' in reverse letter order is 'NEGRONI'.

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I've seen this clue in The Telegraph.

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