Copy, simulate (7)
I believe the answer is:
imitate
I believe this is a double definition.
'copy' is the first definition.
(I know that copy can be written as imitate)
'simulate' is the second definition.
(I know that simulate can be written as imitate)
(Other definitions for imitate that I've seen before include "Copy or mimic" , "Follow suit" , "Fake" , "Parrot" , "Copy someone" .)