Crossword Genius

Busy topping up the bottom drawer? (7)

Ross

I believe the answer is:

engaged

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'busy' is the definition.
(similar in meaning)

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

Can you help me to learn more?

(Other definitions for engaged that I've seen before include "Fully committed - to get married?" , "Occupied with business - about to marry?" , "Promised in marriage" , "Started to fight" , "Bound by promise" .)

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