Long-necked wading bird (5)
(Other definitions for crane that I've seen before include "Hoist; wading bird" , "Lifting machine or long-legged bird" , "Large long-necked wading bird" , "Stretch out (one's neck)" , "Wading bird - lifting device" .)
'long-necked wading bird' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for heron that I've seen before include "Graceful grey bird with long neck" , "One bird" , "eg Egret" , "Wader" , "Bird of the Rhone, strangely" .)