Crossword Genius

Rarely treat in salt (7)

Ross

I believe the answer is:

nitrate

'salt' is the definition.
(nitrate is a kind of salt)

'rarely treat in' is the wordplay.
'rarely' indicates an anagram (rare can mean unusual or strange).
'treat'+'in'='treatin'
'treatin' anagrammed gives 'NITRATE'.

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

I've seen this clue in The Times.
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