Comedians disturbed about upper-class lying (10)
I believe the answer is:
mendacious
'lying' is the definition.
(mendacious means dishonest)
'comedians disturbed about upper-class' is the wordplay.
'disturbed' indicates anagramming the letters (the order of letters is disturbed).
'about' indicates putting letters inside.
'upper-class' becomes 'u' (similar in meaning).
'comedians' anagrammed gives 'mendacios'.
'mendacios' placed around 'u' is 'MENDACIOUS'.
(Other definitions for mendacious that I've seen before include "Untruthful" , "Given to lying" , "falsifying accounts?" .)