One gypsy or many, maybe (6)
I believe the answer is:
romany
'one gypsy' is the definition.
(synonyms)
'or many maybe' is the wordplay.
'maybe' indicates anagramming the letters.
'or'+'many'='ormany'
'ormany' anagrammed gives 'ROMANY'.
(Other definitions for romany that I've seen before include "Traveller" , "one of those travelling" , "Gypsy language" , "Language of gypsies" , "Roy, man, you're a gypsy" .)