I'm unsure of two answers...
8 D. Expert labourer? Not very good (5) one?r I can see one-er, expert, but I don't understand how the rest of the clue works.
13 A. A blow for Aussies: no trace of top criminal (6) a?u??r
'Abuser' would fit 'criminal', but again I don't get the rest.
Any advice welcome.