Money prohibited, we hear, for musicians (5,4)
I believe the answer is:
brass band
'musicians' is the definition.
(group of musicians)
'money prohibited we hear' is the wordplay.
'money' becomes 'brass' (brass can informally mean money).
'prohibited' becomes 'banned' (banning is a kind of prohibiting).
'we hear' shows a homophone (sound like).
'banned' sounds like 'band'.
'brass'+'band'='BRASS BAND'
'for' is the link.
(Other definitions for brass band that I've seen before include "Musical group" , "cheap alternative to gold ring" , "Group of wind instruments" , "Group of musicians, maybe military" , "Ensemble often associated with factories or towns" .)