Representatives in the east don't notice constellation (10)
I believe the answer is:
emissaries
'representatives' is the definition.
(emissary is a kind of representative)
'east don't notice constellation' is the wordplay.
'east' becomes 'e' (abbreviation).
'don't notice' becomes 'miss' (I can't justify this - if you can you should give a lot more credence to this answer).
'constellation' becomes 'aries' (Aries is an example).
'e'+'miss'+'aries'='EMISSARIES'
'in the' is the link.
Can you help me to learn more?
(Another definition for emissaries that I've seen is " Agents".)