Had been seen, I would say (4)
I believe the answer is:
eyed
'had been' is the definition.
I can't judge whether this defines the answer.
'i would say' is the wordplay.
'i would' becomes 'I'd'.
'say' shows a homophone (sound like).
'id' is a homophone of 'EYED'.
'seen' is the link.
Can you help me to learn more?
(Other definitions for eyed that I've seen before include "Ogled" , "Looked at closely" , "Watched, looked at" , "Spotted" , "Stared at" .)