Deem to be deliberate (8)
I believe the answer is:
Here is my best explanation:
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", "Deem to be, regard", "Contemplate", "Suppose", "Think about, reflect upon", "Judge", "Give thought to", "Cogitate", "Muse, mull over" and "Look at someone or something thoughtfully".)