Bird in Eskdalemuir (3)
I believe the answer is:
emu
'bird' is the definition.
(I know that emu is a type of ratite)
'in eskdalemuir' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EMU' can be found hidden inside 'eskdalemuir'.
(Other definitions for emu that I've seen before include "Extinct bird" , "that doesn't get off the ground" , "it can't get off the ground" , "Native Australian bird" , "Aussie runner" .)