Consider intentional (10)
I believe the answer is:
deliberate
I believe this clue is a double definition.
'consider' is the first definition.
('deliberate' can be a synonym of 'consider')
'intentional' is the second definition.
(I've seen this before)
(Other definitions for deliberate that I've seen before include "on purpose" , "Calculated - think carefully" , "Intentional; think carefully" , "put on thinking cap" , "Consider - intentional" .)