Duck, say, to make drink flow better (9)

I believe the answer is:

waterfowl

'duck say' is the definition.
(I know that duck is a type of anseriform bird)

'drink flow better' is the wordplay.
'drink' becomes 'water' (water is an example).
'better' indicates anagramming the letters (with an improved letter-order).
'flow' anagrammed gives 'fowl'.
'water'+'fowl'='WATERFOWL'

'to make' is the link.

(Another definition for waterfowl that I've seen is " Aquatic game birds".)

I've seen this clue in The Daily Express.

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