Ravenous like this and yearning at heart might become carnivorous (9)
I believe the answer is:
voracious
'ravenous' is the definition.
('voracious' can be a synonym of 'ravenous')
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for voracious that I've seen before include "Eager" , "Having great appetite" , "Ravening" , "Excessively greedy" , "Big (of appetite)" .)