Bath's here, fixed by a little plumber finally (8)
I believe the answer is:
somerset
'bath's here' is the definition.
The definition suggests a singular noun which matches the answer.
'fixed by a little plumber finally' is the wordplay.
'fixed' becomes 'set' (both can mean decided or determined).
'by' is a charade indicator (letters next to each other).
'a little' becomes 'some' (both can mean a small amount).
'finally' suggests the final letters.
The last letter of 'plumber' is 'r'.
'some'+'r'='somer'
'set' after 'somer' is 'SOMERSET'.
Can you help me to learn more?
(Other definitions for somerset that I've seen before include "part of south-west England" , "Rome's set up in this English county" , "County of southern England" , "Mendip county; a London House" , "... and another" .)