Considered intentional on the day (11)
I believe the answer is:
deliberated
'considered' is the definition.
('deliberate' can be a synonym of 'consider')
'intentional on the day' is the wordplay.
'intentional' becomes 'deliberate' (synonyms).
'on' is a charade indicator (letters next to each other).
'the day' becomes 'd' (abbreviation for day).
'deliberate'+'d'='DELIBERATED'
(Other definitions for deliberated that I've seen before include "Considered" , "Thought so!" .)