Cryptic across

7 One who may have supported Livingstone discover a biblical clan (6)
8 God, that chap provides backing for a 70s band! (6)
9 Where Peppa Pig was penned, say? (4)
10 Shoot a leading sailor during welcome here in the Gulf (3,5)
11 Diana’s equivalent in record company’s promotion of culture (7)
13 Native American’s going home, getting nothing out of Indonesia (5)
15 Press seen in a part of old Iran (5)
17 Lobby an extraordinarily extravagant city (7)
20 He composed ‘Conquering hero’; top-notch round (8)
21 Finished deliveries by six? (4)
22 Ignite if boy in Rome totally backslides (4,2)
23 Variant doctrine is inadmissible in court, one made out (6)