Derrick (5)
I believe the answer is:
crane
'derrick' is the definition.
(type of construction crane)
This is all the clue.
(Other definitions for crane that I've seen before include "To do it could mean a long stretch" , "Bird; dockside machine" , "Long-necked wading bird and lifting machine" , "Lifter; bird" , "Hoist; wading bird" .)