Badly cut and partly burnt? (6)

I believe the answer is:

gashed

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'badly cut' is the definition.
'gashed' can be an answer for 'cut' (synonyms). I'm not sure about the 'badly' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for gashed that I've seen before include "Wounded" , "Deeply cut" , "Cut open" .)

I've seen this clue in the Evening Standard.

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