Crossword Genius

Knock at nail (6)

Ross

I believe the answer is:

attack

'knock' is the definition.
(I know this)

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

(Other definitions for attack that I've seen before include "act of aggression" , "Ambush - mug - criticise - fit" , "storm" , "Act violently against or criticise strongly" , "Strike" .)

I've seen this clue in The Sun.
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