Yorkshire city comes first, by the sound of it (5)
I believe the answer is:
leeds
'yorkshire city' is the definition.
(city in West Yorkshire)
'comes first by the sound of it' is the wordplay.
'comes first' becomes 'leads' (to lead is to go first).
'by the sound of it' shows a homophone (sound like).
'leads' sounds like 'LEEDS'.
(Other definitions for leeds that I've seen before include "Northern town" , "Championship team" , "City of northern England - castle of southern England" , "City near Bradford" , "22 [FA CUP] runners-up" .)