Excuse members who fart (3,3)

I believe the answer is:

let off

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'excuse' is the definition.
(I know that excuse can be written as let off)

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

Can you help me to learn more?

(Other definitions for let off that I've seen before include "Set free without charge" , "Not punished at all" , "Fire escape" , "Cause to explode or excuse from duties" , "Discharge - absolve" .)

I've seen this clue in the Sydney Morning Herald.

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