Film star or band members (6)
I believe the answer is:
brando
'film star' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?
'or band members' is the wordplay.
'members' indicates anagramming the letters (members or parts of the anagram in a different way).
'or'+'band'='orband'
'orband' anagrammed gives 'BRANDO'.
Can you help me to learn more?
(Other definitions for brando that I've seen before include "'The Godfather'?" , "Hollywood actor" , "Marlon -, US actor" , "Marlon --, film actor" , "actor in 4 26 21 [A STREETCAR NAMED DESIRE]" .)