Flexible joint (5)
'flexible joint' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elbow that I've seen before include "push" , "sharp turn" , "Nudge" , "given to one about to leave" , "Nudging joint?" .)
'flexible joint' is the definition.
(I know that flexible joint can be written as hinge)
This is the entire clue.
(Other definitions for hinge that I've seen before include "Device for letting door etc swing" , "door open because of this?" , "hang" , "Joint on which something turns" , "What a door depends upon!" .)