A bit of fizz in cup Ruth stirred for cocktail (5,5)

I believe the answer is:

fruit punch

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

'a bit of fizz in cup ruth stirred' is the wordplay.
'a bit of' indicates taking the first letters.
'stirred' indicates an anagram.
The first letter of 'fizz' is 'f'.
'in'+'cup'+'ruth'='incupruth'
'incupruth' with letters rearranged gives 'ruitpunch'.
'f'+'ruitpunch'='FRUIT PUNCH'

'for' acts as a link.

I've seen this clue in The Everyman puzzle in The Observer.

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