Outline in professional dossier (7)
I believe the answer is:
profile
'outline' is the definition.
(thesaurus)
'professional dossier' is the wordplay.
'professional' becomes 'pro' ('pro' can be a synonym of 'professional').
'dossier' becomes 'file' (I've seen this before).
'pro'+'file'='PROFILE'
'in' is the link.
(Other definitions for profile that I've seen before include "In which one may be photographed" , "Sideways view" , "Short biographical sketch" , "image" , "dossier" .)