Does it add a twinkle to sea life? (8)
I believe the answer is:
starfish
'life?' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe they are linked in a way I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for starfish that I've seen before include "Sea creature with five arms coming from central disk" , "Asteroid (in the sea)" , "Astral aquatic animal" , "Marine creature with five arms" , "One found at sea" .)