This Willow may be sad (7)

I believe the answer is:

weeping

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'this willow' is the definition.
(weeping willow is a kind of willow)

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

(Other definitions for weeping that I've seen before include "Shedding tears" , "Lachrymose" , "Crying" , "Doleful" .)

I've seen this clue in the Evening Standard.

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