Flog a walking-stick (4)
I believe the answer is:
cane
This clue is a double definition.
'flog' is the first definition.
(synonyms)
'a walking-stick' is the second definition.
(I've seen this before)
(Other definitions for cane that I've seen before include "Stick; thrash" , "Staff < with walking-stick" , "Beat - bamboo - stick" , "Punish; woody stem" , "Strong stem for to allow a plant to climb" .)