Apparent teen slob is working (10)
I believe the answer is:
ostensible
'apparent' is the definition.
(I've seen this before)
'teen slob is working' is the wordplay.
'working' indicates anagramming the letters.
'teen'+'slob'+'is'='teenslobis'
'teenslobis' is an anagram of 'OSTENSIBLE'.
(Other definitions for ostensible that I've seen before include "Manifest" , "Professed" , "Apparent" , "Supposed" , "Seeming" .)