Metaphor for something irresistible (6)

I believe the answer is:

catnip

(Other definitions for catnip that I've seen before include "treat for moggie" , "Scented herb" , "'Hairy herb, strongly attractive to felines (6)'" , "Plant with scented leaves which felines like" , "Kitty likes that!" .)

I've seen this clue in the USA Today.

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