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Furious that Gráinne Mhaol beheaded (5)

Ross

I believe the answer is:

irate

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'furious' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for irate that I've seen before include "Extremely cross" , "Annoyed, nettled" , "Ticked off" , "Angry - furious" , "Full of 22" .)

I've seen this clue in The Irish Times.
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