Crossword Genius

Manifestation of armed power (6)

Ross

I believe the answer is:

biceps

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'manifestation of armed power' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

This is the entire clue.

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(Other definitions for biceps that I've seen before include "Flexor muscle" , "Arm workers" , "Arm muscles" , "Elbow-bending muscle" , "Muscle that flexes the forearm" .)

I've seen this clue in The Globe and Mail.
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