Peers having come up briefly returned drunk (7)

I believe the answer is:

aristos

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'peers' is the definition.
(short for aristocrats)

'come up briefly returned drunk' is the wordplay.
'come up' becomes 'arise' (synonyms).
'briefly' means to remove the last letter.
'returned drunk' becomes 'tos' (I can't justify this - if you can you should give a lot more credence to this answer).
'arise' with its last letter taken away is 'aris'.
'aris'+'tos'='ARISTOS'

'having' is the link.

Can you help me to learn more?

(Other definitions for aristos that I've seen before include "Noblemen" , "peers" , "toffs" , "counts, maybe" .)

I've seen this clue in The Times.

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