Crossword Genius

Attack with stone, roughly (5)

Ross

I believe the answer is:

onset

'attack' is the definition.
(archaic term for a military attack)

'stone roughly' is the wordplay.
'roughly' indicates an anagram.
'stone' anagrammed gives 'ONSET'.

'with' acts as a link.

(Other definitions for onset that I've seen before include "Advent" , "Inception" , "Start - attack" , "Attack using stone" , "Outbreak" .)

I've seen this clue in The Telegraph.
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