Drunken support a foreigner announced (12)

I believe the answer is:

bacchanalian

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'drunken' is the definition.
(synonyms)

'support a foreigner announced' is the wordplay.
'support' becomes 'bacch' (I am not sure about this - if you are sure you should believe this answer much more).
'a' becomes 'an'.
'foreigner' becomes 'alien' (synonyms).
'announced' indicates a 'sounds like' (homophone) clue.
'alien' sounds like 'alian'.
'bacch'+'an'+'alian'='BACCHANALIAN'

Can you help me to learn more?

(Other definitions for bacchanalian that I've seen before include "Relating to drunken revelry" , "Drunken, orgiastic (revel)" , "description of drunken revels" , "drunken reveller" .)

I've seen this clue in The Times and The Sunday Times.

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