Colloquially uncertain or doubtful (4)

I believe the answer is:

iffy

(Other definitions for iffy that I've seen before include "Questionable (inf)" , "Uncertain (colloq.)" , "Not certain, doubtful" , "Informally dubious or uncertain" , "Not to be trusted" .)

I've seen this clue in The Irish Times and the Irish Times (Simplex).

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