One doesn't make a summer drink (7)

I believe the answer is:

swallow

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'drink' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for swallow that I've seen before include "flier" , "Get down" , "See bird" , "Bird - drink" , "Eat or drink" .)

I've seen this clue in The Globe and Mail.

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