Inclined to sound fast (5)

I believe the answer is:

leant

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'inclined' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

(Other definitions for leant that I've seen before include "Rested sideways (on something)" , "Had tendency" , "Tipped" , "Tilted" , "Relied (on); inclined" .)

I've seen this clue in The Globe and Mail.

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