Quickness of the hand is unimportant we hear (7)

I believe the answer is:

sleight

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'quickness' is the definition.
(I know that sleight is a type of quickness)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sleight that I've seen before include "Trickery" , "craft" , "Dexterity (usually of hand)" , "Tricky cunning" , "Skilful deception" .)

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

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