Withdrawing from group consuming ecstasy at party (10)

I believe the answer is:

retreating

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'withdrawing' is the definition.
('retreat' can be a synonym of 'withdraw')

'group consuming ecstasy at party' is the wordplay.
'group' becomes 'ring' (a ring is a criminal organisation).
'consuming' means one lot of letters goes inside another.
'ecstasy' becomes 'E' (informal term for the drug).
'at party' becomes 'treat' (I can't justify this - if you can you should believe this answer much more).
'e'+'treat'='etreat'
'ring' enclosing 'etreat' is 'RETREATING'.

'from' is the link.

Can you help me to learn more?

I've seen this clue in The Hindu.

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