Good connecting passage provided by a Russian composer (6)
I believe the answer is:
glinka
'russian composer' is the definition.
(I've seen this in another clue)
'good connecting passage provided by a' is the wordplay.
'good' becomes 'g' (abbreviation).
'connecting passage' becomes 'link' (I can't justify this - if you can you should give a lot more credence to this answer).
'provided by' means one lot of letters go next to another.
'g'+'link'+'a'='GLINKA'
Can you help me to learn more?
(Other definitions for glinka that I've seen before include "Russian composer (Ruslan and Ludmilla)" , "Russian composer (A Life for the Tsar)" , "Russian composer, d. 1857" .)