Crossword Genius

Clever clogs offloading with a barrow, once (5)

Ross

I believe the answer is:

knoll

'barrow once' is the definition.
(barrow was a historical term for a mound or knoll)

I don't understand the remainder of the clue.

(Other definitions for knoll that I've seen before include "Small rounded hill" , "Round hillock" , "Hummock" , "Small round hill" , "minor eminence" .)

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