Otherwise known as Mrs Alf Garnett (4)

I believe the answer is:

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'otherwise' is the definition.
(synonyms)

I don't understand how the rest of the clue works.

(Other definitions for else that I've seen before include "Besides, otherwise" , "Alternatively" , "Eels (anag)" , "Adverb meaning if not, otherwise" , "Otherwise; different from" .)

I've seen this clue in the Evening Standard.

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