Weapon combining power and tripled energy? (4)

I believe the answer is:

epee

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

I don't understand how the rest of the clue works.

(Other definitions for epee that I've seen before include "sports equipment" , "Fighting blade" , "Use it to fence" , "Fencing sword, heavier than a foil" , "It may offer riposte" .)

I've seen this clue in The Sun.

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