Crossword Genius

Abandon insignificant drudge (5)

Ross

I believe the answer is:

scrub

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'abandon' is the first definition.
(scrub can mean to remove or delete)

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

Can you help me to learn more?

(Other definitions for scrub that I've seen before include "Curbs (anag.)" , "remove cosmetic" , "Area of dense stunted vegetation" , "Wash with a brush" , "Clean with hard brush and soapy water" .)

I've seen this clue in The Telegraph.
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