Well, here it is on Tuesday and I'm still struggling !
10A - Australian novelist does not quite reach the lengths of Godot's creator (5) - Beckett obviously but how ? I have nil !
22A - " ___ ___ 'tis the hour of love", Byron 'Don Juan' (3,5) I have zilch !
7D - Barker's oath (90 I have S???A???T
15D - his work not exactly averse, say (5,4) I haveP?O???O?T