Set one in the road somehow (5)
I believe the answer is:
radio
'set' is the definition.
(set can mean a radio set)
'one in the road somehow' is the wordplay.
'one' becomes 'i' (Roman numeral).
'in the' is an insertion indicator.
'somehow' indicates anagramming the letters.
'road' anagrammed gives 'rado'.
'i' going inside 'rado' is 'RADIO'.
(Other definitions for radio that I've seen before include "Transmit" , "Part of the broadcasting industry" , "Receiving apparatus" , "Marconi invented it" , "Wireless broadcast" .)