Crossword Genius

Generating a stink, but not initially suspicious (4)

Ross

I believe the answer is:

iffy

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'suspicious' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for iffy that I've seen before include "not kosher" , "Dubious, risky (inf.)" , "Unsure" , "Sixth (RU) Nation" , "Doubtful, not definite" .)

I've seen this clue in The Independent.
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