Crossword Genius

Exist as teams, furthermore (7)

Ross

I believe the answer is:

besides

'furthermore' is the definition.
(synonyms)

'exist as teams' is the wordplay.
'exist as' becomes 'be'.
'teams' becomes 'sides' (eg football sides).
'be'+'sides'='BESIDES'

(Other definitions for besides that I've seen before include "Additionally" , "Moreover" , "also is available" , "to boot" , "What's more" .)

I've seen this clue in The Mirror.
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