Crossword Genius

Sounded like oxen - or their burden? (5)

Ross

I believe the answer is:

lowed

'sounded like oxen' is the definition.
('low' is another word for 'moo')

I don't understand the rest of the clue.

(Other definitions for lowed that I've seen before include "made noises like farm animals" , "Mooed" , "How Jersey communicated" .)

I've seen this clue in The Independent.
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