Obscure saint one takes to be a Balt (8)
I believe the answer is:
estonian
'a balt' is the definition.
(I've seen this before)
'obscure saint one' is the wordplay.
'obscure' indicates anagramming the letters.
'saint'+'one'='saintone'
'saintone' is an anagram of 'ESTONIAN'.
'takes to be' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for estonian that I've seen before include "Baltic state native" , "From Tallinn, for example" , "Balt" , "Person from Tallinn, say." , "European language" .)