Hunger — it’s terrible, no doubt (4,5)
I believe the answer is:
sure thing
'no doubt' is the definition.
(both can refer to a certainty)
'hunger it's terrible' is the wordplay.
'terrible' indicates an anagram.
'hunger'+'its'='hungerits'
'hungerits' with letters rearranged gives 'SURE THING'.
(Other definitions for sure thing that I've seen before include "of course" , "cert" , "no chance of losing" , "A certainty - I agree!" .)