How to cook new hatchlings from the bottom of the sea? (4-3)
I believe the answer is:
deep-fry
'how to cook' is the definition.
(deep-frying is a method of cooking)
I don't understand how the rest of the clue works.
(Other definitions for deep-fry that I've seen before include "Cook in oil" , "Cook (chips etc)" , "Fed pyre (anag.)" .)