They sound in favour and are made amorously (4)
I believe the answer is:
eyes
'they sound' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Maybe there's an association between them I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for eyes that I've seen before include "Ophthalmologist's speciality" , "Parts of needles" , "front part of ship" , "Are they made to suggest possible date" , "They have pupils" .)