Ground a drink (4)

I believe the answer is:

soda

'drink' is the definition.
(soda is a kind of drink)

'ground a' is the wordplay.
'ground' becomes 'sod' (both can mean a piece of earth).
'sod'+'a'='SODA'

(Other definitions for soda that I've seen before include "Mixer drink" , "Whisky mixer" , "Fizzy water, goes well with whiskey" , "Type of bread, water or fountain" , "Soft drink" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app