Musician with superior number appearing in catalogue (8)
I believe the answer is:
lutenist
'musician' is the definition.
(I know that lutenist is a type of musician)
'superior number appearing in catalogue' is the wordplay.
'superior' becomes 'U' (U can mean upper-class, as in U and non-U speech).
'number' becomes 'ten' (ten is a kind of number).
'appearing in' means one lot of letters goes inside another.
'catalogue' becomes 'list' (I've seen this in another clue).
'u'+'ten'='uten'
'uten' put into 'list' is 'LUTENIST'.
'with' acts as a link.
(Other definitions for lutenist that I've seen before include "Stringed-instrument player" , "Stringed instrument player" , "Instrumentalist" , "Plucky player" .)