Crossword Genius

Box contains energy weapon (5)

Ross

I believe the answer is:

spear

'weapon' is the definition.
(spear is a kind of weapon)

'box contains energy' is the wordplay.
'box' becomes 'spar' (sparring is a kind of boxing).
'contains' is an insertion indicator.
'energy' becomes 'e' (physics symbol as in E=mc2).
'spar' enclosing 'e' is 'SPEAR'.

(Other definitions for spear that I've seen before include "stick" , "A bit of asparagus" , "Weapon to throw" , "Pole with pointed end" , "Thrown weapon" .)

I've seen this clue in The Telegraph.
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