Bird Science Museum exhibits (3)
I believe the answer is:
emu
'bird' is the definition.
(emu is a kind of bird)
'science museum exhibits' is the wordplay.
'exhibits' says the answer is hidden in the clue.
'EMU' is hidden in the letters of 'science museum'.
(Other definitions for emu that I've seen before include "that doesn't get off the ground" , "Flightless bird of Australia, like ostrich" , "Native Australian bird" , "one offering challenge to Hull?" , "Large Australian flightless bird" .)