Concerned with American singer/actress, revolutionary, known only to connoisseurs, .... (9)
I believe the answer is:
recherche
'concerned' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?
'american singeractress revolutionary known only to connoisseurs' is the wordplay.
I cannot quite understand how this works, but
'revolutionary' could be 'che' (Che Guevara the Marxist revolutionary) and 'che' is located in the answer.
This may be the basis of clue (or it may be nonsense).
'with' acts as a link.
Can you help me to learn more?
(Other definitions for recherche that I've seen before include "Rare or exotic (French)" , "choice" , "Rare or far-fetched, like her creche" , "Rare, exotic, obscure" , "Little-known" .)