Basin I'd stowed in punt (5)
I believe the answer is:
bidet
'basin' is the definition.
(I know that bidet is a type of basin)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for bidet that I've seen before include "Bathroom appliance" , "Bathroom fitting" , "Washing facility" , "Bathroom facility" , "Bathroom feature" .)