Funny cartoon about oddly rum bird (9)
I believe the answer is:
cormorant
'bird' is the definition.
(cormorant is a kind of bird)
'funny cartoon about oddly rum' is the wordplay.
'funny' indicates an anagram.
'about' indicates putting letters inside.
'oddly' means one should take alternating letters.
The alternating letters of 'rum' are 'rm'.
'cartoon' is an anagram of 'coorant'.
'coorant' enclosing 'rm' is 'CORMORANT'.
(Other definitions for cormorant that I've seen before include "Diving coastal bird" , "Black diving bird" , "18's [BIRD]" , "Large, voracious seabird" , "Proverbially gluttonous seabird" .)