Crossword Genius

Feeble fellows, but maybe not easy to kill (5)

Ross

I believe the answer is:

weeds

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'kill' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for weeds that I've seen before include "Are they worn by widows in the garden?" , "Black garments once worn by widows" , "Unwanted plants" , "mourning clothes" , "Wild plants; mourning garb" .)

I've seen this clue in the Evening Standard.
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