Great stir produced by travelling Estonians (9)
I believe the answer is:
sensation
'great stir' is the definition.
'sensation' can be an answer for 'stir' (sensation is a kind of stir). I'm unsure of the 'great' bit.
'travelling estonians' is the wordplay.
'travelling' is an anagram indicator.
'estonians' is an anagram of 'SENSATION'.
'produced by' is the link.
Can you help me to learn more?
(Other definitions for sensation that I've seen before include "Crowd puller" , "Feeling produced by stimulation, or dramatic news (9)" , "Scandal" , "Scandalous news item" , "Feeling, awareness of stimulation" .)