Crossword Genius

Attack! Throw a stone (5)

Ross

I believe the answer is:

onset

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

'throw a stone' is the wordplay.
'throw' indicates anagramming the letters.
'stone' anagrammed gives 'ONSET'.

(Other definitions for onset that I've seen before include "Beginning or early stages" , "Stone (anag)" , "Assault; beginning" , "First signs" , "Start, beginning" .)

I've seen this clue in The Globe and Mail.
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