Effervescent US author embraced by faculty outsiders (6)
I believe the answer is:
frothy
'effervescent' is the definition.
(I know that effervescent can be written as frothy)
'us author embraced by faculty outsiders' is the wordplay.
'us author' becomes 'Roth' (novelist Philip Roth).
'embraced by' indicates putting letters inside.
'outsiders' suggests removing the centre (only the letters on the outside of the word remain).
'faculty' with its middle taken out is 'fy'.
'roth' put inside 'fy' is 'FROTHY'.
(Other definitions for frothy that I've seen before include "Leopard-like feline" , "Covered with foam, like superficial talk" , "Sudsy" , "Very bubbly" , "Foamy; insubstantial" .)