Having taken power will continue, you suppose (7)
I believe the answer is:
presume
'suppose' is the definition.
(I've seen this before)
'having taken power will continue' is the wordplay.
I cannot really understand how this works, but
'power' could be 'p' (symbol in physics) and 'p' is present in the answer.
'continue' could be 'resume' (resuming is a kind of continuing) and 'resume' is located in the answer.
No letters remain.
This explanation may well be incorrect...
'you' acts as a link.
Can you help me to learn more?
(Other definitions for presume that I've seen before include "Suppose without proof" , "Surmise" , "Suppose; take liberties" , "Take to be the case" , "Believe" .)