Deem to be deliberate (8)
I believe the answer is:
consider
I believe this clue is a double definition.
'deem to be' is the first definition.
(I've seen this before)
'deliberate' is the second definition.
('consider' can be a synonym of 'deliberate')
(Other definitions for consider that I've seen before include "Take into account" , "Hold" , "Suppose" , "Think about, reflect upon" , "Contemplate" .)