In Dynasty, women’s nasal speech (5)
I believe the answer is:
twang
'nasal speech' is the definition.
(I've seen this before)
'in dynasty women's' is the wordplay.
'in' is an insertion indicator.
'dynasty' becomes 'tang' (Chinese dynasty).
'women' becomes 'w'.
'tang' enclosing 'w' is 'TWANG'.
(Other definitions for twang that I've seen before include "accent's nasal sound" , "Sound of a tense wire or bowstring being plucked" , "Nasal tone of voice" , "Plucking sound - nasal tone" , "nasal effect" .)