19 down
Spider
has
distinctive
pattern
on
behind
occasionally
(7)
Spider has distinctive pattern on behind occasionally (7)
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The definition is at the beginning of the clue.
How the clue works
Look at Spider — that's your definition, covering any member of the arachnid order Araneae. The wordplay stitches together ARAN (that distinctive knitting pattern) with EID, which you get by taking the occasional — alternate — letters of b-E-h-I-n-D.