Some haggard entertainer's enthusiastic (6)
I believe the answer is:
ardent
'enthusiastic' is the definition.
(similar in meaning)
'some haggard entertainer's' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'ARDENT' can be found hidden inside 'haggard entertainers'.
(Other definitions for ardent that I've seen before include "Loving and fiery" , "'Fervent, impassioned (6)'" , "Enthusiastic or passionate" , "Ranted, being passionate" , "Passionate and glowing" .)