Outstanding passage from theremin entertains (7)
I believe the answer is:
eminent
'outstanding' is the definition.
(eminent can mean esteemed or outstanding)
'passage from theremin entertains' is the wordplay.
'passage from' indicates a hidden word (a sequence or passage of letters from the clue).
'EMINENT' is hidden in the letters of 'theremin entertains'.
(Other definitions for eminent that I've seen before include "Distinguished and admired" , "Famous and respected" , "Lofty; famous" , "Exalted in rank" , "Distinguished, prominent" .)