Inclination to buzz off? (5)

I believe the answer is:

slope

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'inclination' is the definition.
(slope is a kind of inclination)

I cannot understand how the remainder of the clue works.

(Other definitions for slope that I've seen before include "See 28" , "decamp" , "Tilt with poles" , "Gradient, incline" , "Be inclined" .)

I've seen this clue in the Evening Standard.

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