Specialised skill? Get to work in the allotment immediately, says Spooner (4-3)

I believe the answer is:

know-how

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'specialised skill?' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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

I've seen this clue in The Everyman puzzle in The Observer.

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