Assume; imagine (7)
I believe the answer is:
suppose
This clue is a double definition.
'assume' is the first definition.
(I know that suppose is a type of assume)
'imagine' is the second definition.
(I know that imagine can be written as suppose)
(Other definitions for suppose that I've seen before include "Presume" , "'Believe, perhaps on uncertain grounds (7)'" , "Assume, imagine" , "Fancy" , "Expect" .)