Rude call-out is heard in part (7)
I believe the answer is:
loutish
'rude' is the definition.
(thesaurus)
'call-out is heard in part' is the wordplay.
'in part' indicates a hidden word.
'LOUTISH' is hidden within 'call out is heard'.
(Other definitions for loutish that I've seen before include "like a hooligan" , "uncouth and aggressive" , "Boorish" , "Ill-mannered and coarse, behaviour say" .)