Tool will astonish daughter, taking mother's place (4)
I believe the answer is:
adze
'tool' is the definition.
(adze is a kind of tool)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for adze that I've seen before include "Wood-dressing tool" , "Woodworker's tool" , "Axe-like tool" , "Daze (anag.)" , "Edge tool used to cut and shape wood" .)