Friend across street with cocaine, ultimately arrested (6)
I believe the answer is:
busted
'arrested' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?
'friend across street with cocaine ultimately' is the wordplay.
'friend' becomes 'bud' (short for buddy).
'across' is an insertion indicator.
'street' becomes 'st' (abbreviation).
'with' means one lot of letters go next to another.
'ultimately' suggests the final letters.
The final letter of 'cocaine' is 'e'.
'st'+'e'='ste'
'bud' enclosing 'ste' is 'BUSTED'.
Can you help me to learn more?
(Other definitions for busted that I've seen before include "Broken; raided (US)" , "having knockers" , "Shattered" .)