Gives out, eyelids fluttering with energy singularly gone (6)
I believe the answer is:
yields
'gives' is the definition.
(yielding is a kind of giving)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for yields that I've seen before include "Crops or dividends" , "outputs" , "Succumbs" , "bows" , "Investment returns" .)