Sea creature acoustically generates power (6)
I believe the answer is:
muscle
'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" .)