Across
1 Where a monk might hold an audience? (10) Auditorium
7 Interrupt holiday? That's not on (5,3) Break off
8 Plagiarise work submitted to newspaper (4) Copy
9 A minor conflict with Germany (4) Ward
10 Desire Chevy initially, to be included in New York drive (7) Urgency
12 I indicate you're getting warmer (11) Temperature
14 Pretend gold's imported from overseas (7) Foreign
16 A mixture of oils used for harvest hopper (4) Silo
19 Beneficial sort ... (4) Kind
20 ... is a pain to the old bean! (8) Headache
21 Mysterious grotto (unknown) led to me (10) Troglodyte

Down
1 With it, 6 could make a killing (5) Arrow
2 The plan is to raise help then wait, apparently (7) Diagram
3 Stole is overly grand (4) Took
4 What to do with farmer to restore drive? (8) Reformat
5 Relative to a pawnbroker (5) Uncle
6 An assistant to a revolutionary Indian (6) Apache
11 Fence is a swine and a prickly little fella (8) Hedgehog
12 Subject had run-in with cancer (6) Tropic
13 One would have this characteristic (7) Unitary
15 Duck identification being always without it (5) Eider
17 Colour in loch reflected by light source (5) Ochre
18 Ring round after Henry (4) Halo