Saltpeter, for one (7)

I believe the answer is:

nitrate

'saltpeter for one' is the definition.
(saltpeter is a kind of nitrate)

This is all the clue.

(Other definitions for nitrate that I've seen before include "Tear tin up for fertiliser" , "Nattier (anag.)" , "Fertilizer" , "following 28 [SILVER]" , "salt" .)

I've seen this clue in The Wall Street Journal.

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