Crossword Genius

Quick learner, free from affectation (7)

Ross

I believe the answer is:

natural

I believe this is a double definition.

'quick learner' is the first definition.
(someone who is a natural at something)

'free from affectation' is the second definition.
(that which is not affected)

(Other definitions for natural that I've seen before include "Unaffected, normal in manner" , "(Of fabric) off-white" , "Innate, inborn" , "Relaxed, unaffected" , "person regarded as certain to qualify" .)

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