It can be refreshing, stirred into Calvados, etc. (4)

I believe the answer is:

soda

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'it can be refreshing stirred into calvados etc' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for soda that I've seen before include "Soft drink" , "Type of bread, water or fountain" , "Whisky mixer" , "In the US, a sweet fizzy drink" , "Sodium carbonate" .)

I've seen this clue in the Evening Standard.

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