Eastern dynasty maintains western pronunciation (5)
I believe the answer is:
twang
'pronunciation' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'eastern dynasty maintains western' is the wordplay.
'eastern dynasty' becomes 'tang' (Chinese dynasty. I am not sure about the 'eastern' bit.).
'maintains' is an insertion indicator.
'western' becomes 'w'.
'tang' placed around 'w' is 'TWANG'.
Can you help me to learn more?
(Other definitions for twang that I've seen before include "Sound of a tense wire or bowstring being plucked" , "Sharp vibrating sound" , "ringing sound" , "Distinctive nasal style of pronunciation" , "The Sound of Music?" .)