The thing's set in stone, getting Democrat in a tizz (8)
I believe the answer is:
agitated
'a tizz' is the definition.
I can't tell whether this definition defines the answer.
'the thing's set in stone getting democrat' is the wordplay.
'the thing' becomes 'it'.
'set in' means one lot of letters goes inside another.
'stone' becomes 'agate' (I've seen this in another clue).
'getting' says to put letters next to each other.
'democrat' becomes 'd'.
'it' inserted inside 'agate' is 'agitate'.
'agitate'+'d'='AGITATED'
'in' is the link.
Can you help me to learn more?
(Other definitions for agitated that I've seen before include "in troubled state" , "Physically disturbed" , "Upset (by a stirrer?)" , "Physically upset" , "Excited or troubled" .)