In appearance, dashing, jaunty or a bit disreputable (6)

I believe the answer is:

rakish

(Other definitions for rakish that I've seen before include "Jaunty; fast-looking (boat)" , "abandoned" , "Profligate" , "Dashing and slightly disreputable" , "Disreputably dashing" .)

I've seen this clue in The Times and The Sunday Times.

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