1: A language one may read about (9)
5: Boxer Max returned, holding heroin, for treatment (5)
8: Stop-Go see funny type of march! (5,4)
10: Correspond with mother and I boarding train (1-4)
11: Warrior and Republican in fantastic legend (7)
12: Doctrine for some Kiwis makes sense (3)
14: Mend a split state (11)
18: Therefore, finish off this bit of work (3)
19: Scale Ten after taxes (3)
20: For Proust, life's purpose springs from remembrance of a torn desire (6,5)
21: And not in town, ordinarily (3)
22: Vet theatre opening 8-down (3)
23: Guarantee authorisation (7)
27: Idler, upset, stirred (5)
28: Terribly versatile family (9)
29: City official spread rumor, initially (5)
30: Leave sorcerer to bible-basher (9)