Crossword Genius

Sea creature acoustically generates power (6)

Ross

I believe the answer is:

muscle

I'm a little stuck... Click here to teach me more about this clue!

'power' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for muscle that I've seen before include "Contracting body part" , "Might, perhaps" , "Fibrous tissue in the body" , "Bicep or tricep, for instance" , "elevator, for instance" .)

I've seen this clue in The Independent.
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