Are lives of camels and mules so onerous? (10)
I believe the answer is:
burdensome
'onerous?' is the definition.
(I know that onerous can be written as burdensome)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for burdensome that I've seen before include "Oppressive, wearisome" , "Onerous" .)
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