It's nauseating when retired medical leaders cite contrary view (6)
I believe the answer is:
emetic
'it's nauseating' is the definition.
(emetic means causing vomiting)
'when retired medical leaders cite contrary view' is the wordplay.
I cannot quite see how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is found within the answer.
an anagram of 'cite' is 'etic' which is within the answer.
A single letter 'm' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for emetic that I've seen before include "Class including frogs, toads, newts, etc" , "It's taken to cause vomiting" , "Nauseous" , "Medicine taken to make one vomit" , "Medicine causing vomiting" .)