Grab a bit of sleep perhaps (6)

I believe the answer is:

snatch

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'grab' is the definition.
(I know that grab can be written as snatch)

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

Can you help me to learn more?

(Other definitions for snatch that I've seen before include "Appropriate" , "fragment of tune" , "Grab hurriedly or violently" , "weightlifting move" , "Sieze or grab" .)

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

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