God with nothing to eat, lacking energy (4)
I believe the answer is:
odin
'god' is the definition.
(Norse god)
'nothing to eat lacking energy' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'to eat' becomes 'dine' (to dine is to eat a meal).
'lacking' is a deletion indicator.
'energy' becomes 'e' (physics symbol as in E=mc2).
'dine' with 'e' taken out is 'din'.
'o'+'din'='ODIN'
'with' acts as a link.
(Other definitions for odin that I've seen before include "The supreme Norse god and creator" , "mythological personage" , "In Scandinavian myth the supreme god and creator" , "Legendary ruler" , "divine figure" .)