Greet journalist protecting usual extremists? That’s knotty (9)
I believe the answer is:
nodulated
'knotty' is the definition.
(thesaurus)
'greet journalist protecting usual extremists?' is the wordplay.
'greet journalist' becomes 'nodated' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'protecting' means one lot of letters goes inside another.
'extremists?' means to remove the middle letters (I've seen 'extremists' mean this).
'usual' with its centre removed is 'ul'.
'nodated' placed around 'ul' is 'NODULATED'.
'that's' acts as a link.
Can you help me to learn more?
(Another definition for nodulated that I've seen is " Having abnormal growths".)