Crossword Genius

Knock at sharp nail (6)

Ross

I believe the answer is:

attack

'knock' is the definition.
(I know that attack is a type of knock)

'at sharp nail' is the wordplay.
'sharp nail' becomes 'tack' (a tack is a nail).
'at'+'tack'='ATTACK'

(Other definitions for attack that I've seen before include "Strike" , "Show aggression" , "Offensive action" , "Go on the offensive" , "Hit out" .)

I've seen this clue in The Telegraph.
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