Bits of cars changed radio star (9)
I believe the answer is:
radiators
'bits of cars' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe you can see a link between them that I don't see?
'changed radio star' is the wordplay.
'changed' indicates an anagram.
'radio'+'star'='radiostar'
'radiostar' with letters rearranged gives 'RADIATORS'.
Can you help me to learn more?
(Other definitions for radiators that I've seen before include "coolers" , "Heaters" .)