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Across
1 Low blood sugar levels compound myopia with achy leg disorder (13)
8 First three referees drop a familiar phrase (7)
9 Branch of mathematics solving 10x = 99? (5)
10 Most epicarp is amazing (4)
11 Blood vessel from bubbly – and not completely corrupt – characters on the extreme left (4, 4)
13 Herb you should start stocking in junk shop (6)
14 Alternately boycott a DVD or book format (6)
17 Tries to get involved with small ecological niche (8)
19 Make changes to inappropriate diet (4)
21 Small marsupials…
