One of the Eloi after losing heart comes back again (4)
I believe the answer is:
anew
'again' is the definition.
(synonyms)
'one of the eloi after losing heart comes back' is the wordplay.
I cannot quite see how this works, but
'one' could be 'ane' (synonyms) and 'ane' is found in the answer.
A single letter 'w' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for anew that I've seen before include "From the beginning again" , "Again but differently" , "Once more (poetic)" , "Afresh" , "Wane in a different way, again" .)