Unimaginative professionals with a piece of music (7)
I believe the answer is:
prosaic
'unimaginative' is the definition.
(I've seen this before)
'professionals with a piece of music' is the wordplay.
'professionals' becomes 'pros' ('pro' can be a synonym of 'professional').
'with' says to put letters next to each other.
'piece of music' becomes 'ic' (I am not sure about this - if you are sure you should believe this answer much more).
'pros'+'a'+'ic'='PROSAIC'
Can you help me to learn more?
(Other definitions for prosaic that I've seen before include "Poetry would not be so" , "uninspired" , "Matter-of-fact" , "flat" , "Lacking wit or imagination, dull" .)