Crossword Genius

A sharp, pointed item, said to be used during aggressive act (6)

Ross

I believe the answer is:

attack

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'act' is the definition.
(attack is a kind of act)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for attack that I've seen before include "Assault - assail" , "Fiercely criticise" , "Hit out" , "Ambush - mug - criticise - fit" , "Raid" .)

I've seen this clue in The Irish Times.
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