Saw or noticed (8)
I believe the answer is:
observed
I believe this is a double definition.
'saw' is the first definition.
(I've seen this before)
'noticed' is the second definition.
('observe' can be a synonym of 'notice')
(Other definitions for observed that I've seen before include "Abided by, rules say" , "Noticed or remarked" , "Said" , "saw" , "Ascertained by sight" .)