Derrick's bird (5)
I believe the answer is:
crane
I believe this is a double definition.
'derrick's' is the first definition.
(type of construction crane)
'bird' is the second definition.
(crane is a kind of bird)
(Other definitions for crane that I've seen before include "Device for picking up" , "Large long-necked wading bird" , "Stretch out (one's neck)" , "Bird; hoister" , "Wading bird to lift heavy objects?" .)