flair

Napoleon HillのThink and Grow Richを読んでいます。
Those seeing OPPORTUNITY lurking in this suggestion will find valuable aid in the chapter on Organized Planning. Incidentally, an efficient merchandiser of personal services would find a growing demand for his service wherever there are men and women who seek better markets for their serices. By applying the Master Mind principle, a few people with suitable talent, could form an alliance, and have a paying business very quickly. One would need to be a fair writer, with a flair for advertising and selling, one handy at typing and hand lettering, and one should be a first class business getter who would let the world know about the service. If one person possessed all these abilities, he might carry on the business alone, until it outgrew him.
"flair for advertising and selling" の "flair" は文脈からすると、後に出てくる ability と同じ意味の様ですが、辞書で確認します。

・Oxford English Dictionary:

1) A special or instinctive aptitude or ability for doing something well.: she had a flair for languages
2) Stylishness and originality.: she dressed with flair
・Collins Dictionary:

1) If you have a flair for a particular thing, you have a natural ability to do it well.: ...a friend who has a flair for languages.
2) If you have flair, you do things in an original, interesting, and stylish way.: Their work has all the usual punch, panache and flair you'd expect.
なるほど、1)だと生まれつきの能力、２）だと独創性、センスのある才能の意味になるのですね。