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Cryptic across

1 Somehow sat out Advent for the Maundy Mass (6)
4 God, sort of, is king of Ammon (6)
9 Pure tee-off: poetry, she said (7)
10 Heading off to ramble like one in a Tolkien novel (5)
11 Nonconformist’s doctrine is to demonstrate wicked sin at Mass! (13)
12 He drove the revolutionary support for an Assyrian king (11)
16 Jurassic toad I shattered, and a rat? (5,8)
18 Town in Lazio, primarily Roman in etiquette – typically Italian (5)
19 Warm parable opens with a note (7)
20 Female concealing craft gets cross with old authority (6)
21 Insult’s not on when hitting target (6)