Dope may be easy to obtain, ultimately (9)
I believe the answer is:
simpleton
'dope' is the definition.
(I've seen this before)
'easy to obtain ultimately' is the wordplay.
'easy' becomes 'simple' ('simple' can be similar in meaning to 'easy').
'ultimately' indicates one should take the final letters.
The last letter of 'obtain' is 'n'.
'simple'+'to'+'n'='SIMPLETON'
'may be' acts as a link.
(Other definitions for simpleton that I've seen before include "Unintelligent person" , "Blockhead" , "Idiot" , "One very slow" , "Dunce" .)