Believe, imagine (5)
I believe the answer is:
think
This clue is a double definition.
'believe' is the first definition.
(I know that believe can be written as think)
'imagine' is the second definition.
(I know that imagine can be written as think)
(Other definitions for think that I've seen before include "Ponder" , "figure" , "Use one's mind" , "Judge, consider" , "Imagine" .)