Rude about Verrocchio's first bust (9)
I believe the answer is:
insolvent
'bust' is the definition.
(I've seen this before)
'rude about verrocchio's first' is the wordplay.
'rude' becomes 'insolent' (I've seen this before).
'about' indicates putting letters inside.
'first' indicates taking the first letters.
The first letter of 'verrocchio' is 'v'.
'insolent' going around 'v' is 'INSOLVENT'.
(Other definitions for insolvent that I've seen before include "unable to raise the wind" , "strapped for cash" , "gone to the wall" , "Gone bust, without a bean" , "on the rocks" .)