Some koala bears in Lincoln (3)
I believe the answer is:
abe
'lincoln' is the definition.
(Abraham Lincoln)
'some koala bears in' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'ABE' can be found hidden inside 'koala bears in'.
(Other definitions for abe that I've seen before include "President Lincoln was known as Honest ..." , "Lincoln, familiarly" , "Eg, president Lincoln" , "Lincoln's diminutive" .)