Think you regard as (8)
I believe the answer is:
consider
This clue could be a double definition.
'think you' is the first definition.
'consider' can be an answer for 'think' (considering is a kind of thinking). I'm not sure about the 'you' bit.
'regard as' is the second definition.
'consider' can be an answer for 'regard' (synonyms). I'm unsure of the 'as' bit.
Can you help me to learn more?
(Other definitions for consider that I've seen before include "Ponder on" , "Deliberate" , "Think carefully about" , "Think about - judge" , "Look at someone or something thoughtfully" .)