Wader's walking stick holds her back (5)
I believe the answer is:
crane
'wader's' is the definition.
(crane is a kind of wader)
'walking stick holds her back' is the wordplay.
'walking stick' becomes 'cane' (cane is a kind of walking stick).
'holds' means one lot of letters goes inside another.
'back' suggests the final letters (the letter at the back).
The final letter of 'her' is 'r'.
'cane' enclosing 'r' is 'CRANE'.
(Other definitions for crane that I've seen before include "Bird; hoister" , "To do it could mean a long stretch" , "Bird; dockside machine" , "Device for picking up" , "Lifter; bird" .)