The most common and most likely answer to this crossword clue is the 9 letter word CORMORANT
I've seen this crossword clue in The Guardian
C
O
R
M
O
R
A
N
T
More clues leading to the result CORMORANT
- Bird’s jolly in funny cartoon
- Funny cartoon about jolly diver
- Part of plant or insect or bird
- High-flier's diatribe against my doctor
- Winger wrecked motor car touring north
- Birdmanaged to break bed
- Bird with inclination to cross rocky moor to river
- Funny cartoon about oddly rum bird
- My tirade lashes second flier
- Roman and Croat at sea missing a seabird
Buddy explains!

The straight part
We know that "Bird" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bird = cormorant.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CORMORANT mean?
CORMORANT noun- Any of various medium-large black seabirds of the family Phalacrocoracidae, especially the great cormorant, Phalacrocorax carbo.
- A voracious eater.
- Ravenous, greedy.