Word with bread or water (4)
I believe the answer is:
soda
'word with bread or water' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for soda that I've seen before include "Splash served with some spirits" , "pressurised liquid" , "Accompaniment to whisky" , "Type of bread, water or fountain" , "Variety of pop" .)