Crossword Genius

Open up to reveal a weapon (5)

Ross

I believe the answer is:

lance

This clue is a double definition.

'open up' is the first definition.
(lancing is a kind of opening up)

'a weapon' is the second definition.
(lance is a kind of weapon)

'to reveal' acts as a link.

(Other definitions for lance that I've seen before include "Spear for a horse-soldier" , "Incise" , "Pierce (a boil)" , "Long pointed weapon of old" , "steel" .)

I've seen this clue in the Evening Standard.
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