Yearn to follow compassion in complaint (9)
I believe the answer is:
heartburn
'complaint' is the definition.
The definition and answer can be both states of affairs as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'yearn to follow compassion' is the wordplay.
'yearn' becomes 'burn' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to follow' means one lot of letters go next to another (some letters go after or follow others).
'compassion' becomes 'heart' (I've seen this in another clue).
'burn' after 'heart' is 'HEARTBURN'.
'in' is the link.
Can you help me to learn more?
(Other definitions for heartburn that I've seen before include "Form of indigestion" , "Acidic reflux" , "Painful sensation" , "Severe indigestion" , "You'll get feeling of discomfort" .)