Heart to reject a miserable bout of coveting (8)
I believe the answer is:
jealousy
'heart' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'reject a miserable bout of coveting' is the wordplay.
I cannot quite understand how this works, but
'a' is within the answer.
'miserable' could be 'lousy' (I've seen this in another clue) and 'lousy' is located in the answer.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Other definitions for jealousy that I've seen before include "Covetousness - envy" , "It is called the green-eyed monster" , "Envious resentment" , "Suspicious resentment" , "Feeling of envy" .)