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Harrowing duel stopping rivalry extremely suddenly (6)

Ross

I believe the answer is:

rudely

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'suddenly' is the definition.
Both the answer and definition are adverbs. Maybe they are linked in a way I don't understand?

'harrowing duel stopping rivalry extremely' is the wordplay.
'harrowing' indicates anagramming the letters (I've seen this in other clues).
'stopping' is an insertion indicator (stopping can mean blocking a gap).
'extremely' suggests removing the centre.
'rivalry' with its middle removed is 'ry'.
'duel' anagrammed gives 'udel'.
'udel' inserted into 'ry' is 'RUDELY'.

Can you help me to learn more?

(Other definitions for rudely that I've seen before include "Coarsely" , "Discourteously" , "In an impolite manner" .)

I've seen this clue in The Guardian.
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