Carry out, fulfil (7)
I believe the answer is:
execute
I believe this clue is a double definition.
'carry out' is the first definition.
(I know that carry out can be written as execute)
'fulfil' is the second definition.
(I know that fulfil can be written as execute)
(Other definitions for execute that I've seen before include "Carry out, perform" , "Put (plan) into effect; kill (a condemned person)" , "Off with his head" , "Carry into effect" , "Carry out; behead" .)