Radio broadcast about new, extremely devious robots (8)
I believe the answer is:
androids
'robots' is the definition.
(android is a kind of robot)
'radio broadcast about new extremely devious' is the wordplay.
'broadcast' indicates an anagram.
'about' means one lot of letters goes inside another.
'new' becomes 'n' (**).
'extremely' suggests removing the centre.
'devious' with its middle removed is 'ds'.
'radio' is an anagram of 'adroi'.
'adroi' going around 'n' is 'androi'.
'androi'+'ds'='ANDROIDS'
(Other definitions for androids that I've seen before include "Human-looking robots" , "Communication devices" , "Automatons that resemble humans" , "Robots in human form as in science fiction" , "Robots that resemble humans" .)