flair (n.) Look up flair at Dictionary.com
mid-14c., "an odor," from Old French flair "odor or scent," from flairer "to smell," from Vulgar Latin *flagrare, dissimilated from Latin fragrare "emit (a sweet) odor" (see fragrant). Sense of "special aptitude" is American English, 1925, perhaps from notion of a hound's ability to track scent.