Unable to stomach the extremes of hazardous waste (4)
I believe the answer is:
hate
'hazardous waste' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'unable to stomach the extremes' is the wordplay.
'unable to' becomes 'ha' (I can't justify this - if you can you should give a lot more credence to this answer).
'stomach' becomes 'take' (stomach can mean to tolerate or take).
'the extremes' suggests removing the centre.
'take' with its centre removed is 'te'.
'ha'+'te'='HATE'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for hate that I've seen before include "Intense dislike" , "Strongly dislike" , "Dislike intensely" , "Despise" , "Abominate" .)