Saltwater (5)

I think it could be either:

Which length description are you looking for?:

marine

'saltwater' is the definition.
(synonyms)

This is all the clue.

(Other definitions for marine that I've seen before include "Maritime - seagoing soldier" , "Airmen (anag.)" , "Concerning the sea" , "Sea-soldier" , "Soldier associated with a navy" .)

I've seen this clue in The New York Times.

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