Put together dope crest spending millions on diamonds (9)
I believe the answer is:
assembled
'put together' is the definition.
(thesaurus)
'dope crest spending millions on diamonds' is the wordplay.
I cannot quite see how this works, but
'dope' could be 'ass' (both can mean a stupid person) and 'ass' is present in the answer.
'millions' could be 'm' (abbreviation) and 'm' is found within the answer.
'diamonds' could be 'd' (abbreviation in card games) and 'd' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for assembled that I've seen before include "Met up" , "Brought together" , "Constructed" , "Gathered in one place or put together" , "Congregated, gathered" .)