Bird song under the baobob tree -- finally! (5)
I believe the answer is:
grebe
'bird' is the definition.
(grebe is a kind of bird)
'song under the baobob tree finally' is the wordplay.
'finally' indicates one should take the final letters.
The last letters of 'song under the baobob tree' are 'GREBE'.
(Other definitions for grebe that I've seen before include "I'll dive in" , "Freshwater diving bird" , "Diver" , "Swimmer" , "Small bird that builds floating nests" .)