Crossword Genius

Reasonableness blowing top over domestic slave (4)

Ross

I believe the answer is:

esne

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'domestic slave' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

(Other definitions for esne that I've seen before include "Domestic slave in Anglo-Saxon times" , "Drudge" .)

I've seen this clue in The Sunday Times and The Times.
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