Radio's means of marketing woodcutter's tool (4)
I believe the answer is:
adze
'tool' is the definition.
(adze is a kind of tool)
'radio's means of marketing woodcutter's' is the wordplay.
I cannot quite see how this works, but
'marketing' could be 'ad' (advertisement is a type of marketing) and 'ad' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for adze that I've seen before include "cutter" , "One used to cut" , "Tool for shaping timber" , "Woodworking tool" , "Axe-like tool" .)