Ingenuity, aptitude or skill (4-3)

I believe the answer is:

know-how

(Other definitions for know-how that I've seen before include "Ingenuity - aptitude - skill" , "Ingenuity - experience" , "Ingenuity - aptitude - knack" , "Practical knowledge or skill" , "Technique, expertise" .)

I've seen this clue in The Guardian.

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