Simulate (5)
'simulate' is the definition.
(I know that simulate can be written as feign)
This is all the clue.
(Other definitions for feign that I've seen before include "Counterfeit, simulate" , "outdated shape" , "Simulate, fake" , "Copy" , "Pretend, simulate" .)
'simulate' is the definition.
(I know that simulate can be written as imitate)
This is the entire clue.
(Other definitions for imitate that I've seen before include "Fake" , "Follow suit" , "I tame it (anag)" , "'Ape, copy (7)'" , "Take as a model" .)