Clinician meets noisy extremists adopting knowingly mischievous description of realm (8)
I believe the answer is:
monarchy
'realm' is the definition.
(I've seen this before)
'clinician meets noisy extremists adopting knowingly mischievous description' is the wordplay.
I cannot really see how this works, but
'mischievous' could be 'arch' (arch can mean mischievous or playful) and 'arch' is present in the answer.
The remaining letters 'mony' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for monarchy that I've seen before include "realm" , "Rule by a king or queen" , "kind of government" , "sort of government" , "Rule by a sovereign" .)