The last 5 :
17A : A genus of crocodilian reptiles of the Middle Jurassic period (11) : T?L?O?A?R?S : assume T?L?OSAURUS?
30A : Made to do battle according to Spenser (10) : ???R?I?H?D : I had thought of SKIRMISHED?
10D : Strategic possibility of overthrowing a government by mass demonstrations (7,6) : L?I?Z?G,?P?I?H : I had thought of LIEPZIG?
29D : Spiders as a class or order (9) : A?A?E?D?E
31D : To grow or enlarge (8) : ??C?E?C? : If 30A is ‘skirmished’ then this has to start with a 'K'
Many thanks