In Tennessee, thermal springs bubble and boil (6)
I believe the answer is:
seethe
'boil' is the definition.
(I know that boil can be written as seethe)
'in tennessee thermal springs' is the wordplay.
'in' says the answer is hidden in the clue.
'SEETHE' can be found hidden inside 'tennessee thermal springs'.
'bubble and' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for seethe that I've seen before include "Steep - surge" , "'Boil, with anger perhaps (6)'" , "Smoulder" , "Boil turbulently" , "get very angry" .)