Said to have seen (8)
I believe the answer is:
observed
I believe this clue is a double definition.
'said' is the first definition.
(observing is a kind of saying)
'seen' is the second definition.
(synonyms)
'to have' is the link.
(Other definitions for observed that I've seen before include "Kept an eye on" , "Said" , "Noticed or abided by" , "Noticed or remarked" , "Watched - obeyed" .)