Found this very hard - finally left with 7 - would much appreciate assistance please!!
5 Across Second half of Burgess novel has second papers on caliphate ????S??;
12 across For instance, wicked demon most found at out bits of underworld@s ?????E??;
18 Across Dr Jones is at home, decidedly on vacation I?D?;
4 Down Headmistress only partly as keen as Harriet in collecting riddles? N?S?;
5 down Tess and Angel Clare's perhaps, constituting a doubtfully legal one???C???R?S?;
6 down A loud 26 by a Nobel prizewinning novelist ??L??? -(some kind of speech?) and
8 down Female speaking in French not English with German abandoned ??S???D