Hatred of nausea? (3,7)
I believe the answer is:
ill feeling
'hatred of nausea?' is the definition.
The definition suggests a singular noun which matches the answer.
'hatred of nausea?' is the wordplay.
'hatred of' becomes 'ill' (I can't justify this - if you can you should give a lot more credence to this answer).
'nausea?' becomes 'feeling' (nausea is a kind of feeling).
'ill'+'feeling'='ILL-FEELING'
Can you help me to learn more?
(Other definitions for ill feeling that I've seen before include "bad blood" , "Sickly sensation" .)