Crossword Genius

Worry about horse butchery (7)

Ross

I believe the answer is:

carnage

'butchery' is the definition.
('carnage' can be a synonym of 'butchery')

'worry about horse' is the wordplay.
'worry' becomes 'care' (I've seen this before).
'about' means one lot of letters goes inside another.
'horse' becomes 'nag' (nag is a kind of horse).
'care' placed around 'nag' is 'CARNAGE'.

(Other definitions for carnage that I've seen before include "Bloodshed" , "Killing of large numbers" , "Widespread killing" , "Multiple killing" , "Bloody slaughter as in battle" .)

I've seen this clue in The Independent.
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