31 young man is a '?????ling' - lose 'ling'.
34 OE is the 'grandchild' (3 letters for 'judge' minus its 'u').
32 THESE
35 'general situation' = LIE ('o' is extra).
Thanks ProfessorM.
I now have a complete grid.
The 13 extra letters make no sense but I have added words that mean plenty in thematic grid entries.
No idea where they are significant.