Solemn music from dreary Cambridgeshire town (4,5)
I believe the answer is:
dead march
'solemn music' is the definition.
(I've seen this before)
'dreary cambridgeshire town' is the wordplay.
'dreary' becomes 'dead' (dead can mean boring).
'cambridgeshire town' becomes 'March' (March is a town in Cambridgeshire).
'dead'+'march'='DEAD-MARCH'
'from' acts as a link.
(Other definitions for dead march that I've seen before include "serious strains" , "Music suitable for a funeral procession" , "Funeral pace by army escort" , "Military movement" , "Music for funeral processions" .)