Some log in with permutation of made up expression (9)
I believe the answer is:
neologism
'made up expression' is the definition.
(a neologism is a newly coined word)
'some log in with permutation' is the wordplay.
'some log in' anagrams to 'NEOLOGISM'.
But, I am not clear how this is indicated.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for neologism that I've seen before include "coinage" , "new term" , "Newly coined word" , "Newly-coined word or expression" , "Brexit maybe" .)