From The Collaborative International Dictionary of English v.0.48:
Flair \Flair\ (fl[^a]r), n. [OE. flaireodor, fr. OF. & F. flair,
fr. OF. flairier, F. flairer, to smell, LL. flagrare for L.
fragrare. See Flagrant.]
1. Smell; odor. [Obs.]
[Webster 1913 Suppl.]
2. Sense of smell; scent; fig., discriminating sense.
[Webster 1913 Suppl.]
3. A talent or ability, expecially an intuitive one that
makes performance of a task appear easy; an intuitive
appreciation; a knack; as, she has a flair for acting.
[PJC]
4. An attractive way of performing a task; style.
[PJC]