They give full retirement (7)
I believe the answer is:
suppers
'they' is the definition.
Both the definition and answer are plural nouns.
Maybe you can see a link between them that I don't see?
'give full retirement' is the wordplay.
'give' becomes 'sup' (supping is a kind of giving).
'full retirement' becomes 'pers' (I can't explain this - if you can you should give a lot more credence to this answer).
'sup'+'pers'='SUPPERS'
Can you help me to learn more?
(Another definition for suppers that I've seen is " meals".)