Suggested by 41, the other unclued lights were worms entered backwards in the grid. To comply with the preamble, 6 down needs to be CESTODE (the individual worm) rather than CESTODA (the subclass).
First prize Leslie Verth, Newton Mearns, Glasgow
Runners-up Roslyn Shapland, Ilkeston, Derbyshire. Oenone Green, Feltham, Middlesex
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