Saltwater (5)

I believe the answer is:

brine

'saltwater' is the definition.
(synonyms)

This is all the clue.

(Other definitions for brine that I've seen before include "Salty water" , "preservative" , "Salted water" , "Solution of salt in water" , "Strong salt-water solution" .)

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

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