Entire US turning greedy (8)
I believe the answer is:
esurient
'greedy' is the definition.
('esurient' can be a synonym of 'greedy')
'entire us turning' is the wordplay.
'turning' indicates anagramming the letters.
'entire'+'us'='entireus'
'entireus' is an anagram of 'ESURIENT'.
(Other definitions for esurient that I've seen before include "Rapacious" , "Hungry, greedy" , "Greedy; ensure it (anag.)" , "could eat a horse" , "Hungry; retinues (anag.)" .)