They see eastern agreement (4)
I believe the answer is:
eyes
'they' is the definition.
Both the definition and answer are plural nouns.
Maybe you can see a link between them that I can't see?
'eastern agreement' is the wordplay.
'eastern' becomes 'e'.
'agreement' becomes 'yes' (saying yes to something).
'e'+'yes'='EYES'
'see' is the link.
Can you help me to learn more?
(Other definitions for eyes that I've seen before include "Closely looks at" , "Visual organs" , "Poetically, they're the windows of the soul" , "Organs of sight" , "Needle holes" .)