One departs, perhaps, when they fall (6)

I believe the answer is:

leaves

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'one departs' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for leaves that I've seen before include "Disappears" , "some tea, perhaps" , "Organs of photosynthesis" , "Doesn't eat" , "Steps out of" .)

I've seen this clue in the Evening Standard.

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