Caesar in trouble with birds (8)
I believe the answer is:
canaries
'birds' is the definition.
(canary is a kind of bird)
'caesar in trouble' is the wordplay.
'trouble' indicates an anagram.
'caesar'+'in'='caesarin'
'caesarin' is an anagram of 'CANARIES'.
'with' is the link.
(Other definitions for canaries that I've seen before include "Yellow birds or islands off Africa" , "Atlantic islands - cagebirds" , "Yellow songbirds or Spanish islands off Africa" , "Islands and yellowish birds" , "The birds forewarn of danger in the mines" .)