Grammarian's state of mind? (4)
I believe the answer is:
mood
This clue could be a double definition.
'grammarian's state' is the first definition.
'mood' can be an answer for 'state' (mood is a kind of state). I'm not certain of the 'grammarian's' bit.
'mind?' is the second definition.
(thesaurus)
'of' is the link.
Can you help me to learn more?
(Other definitions for mood that I've seen before include "Disposition" , "An atmosphere of doom" , "Temporary state of mind" , "State of mind or emotion" , "Doom (anag)" .)