Radio makes sound use of them (7)
I believe the answer is:
effects
'radio makes' is the definition.
The answer and definition can be both related to thinking as well as being plural nouns.
Maybe you can see a link between them that I don't see?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for effects that I've seen before include "Total possessions" , "one's luggage" , "Consequences or possessions" , "theatrical aids" , "Carries out" .)