Commercials on radio identifying woodworker’s tool (4)
I believe the answer is:
adze
'woodworker's tool' is the definition.
(I've seen this before)
'commercials on radio' is the wordplay.
'commercials' becomes 'ads' (advertisements).
'on radio' indicates a 'sounds like' (homophone) clue.
'ads' sounds like 'ADZE'.
'identifying' acts as a link.
(Other definitions for adze that I've seen before include "Wood-shaping tool" , "Daze with a sort of axe" , "Wood-cutting tool" , "Cutting tool with arched blade" , "Tool for shaping large pieces of wood" .)