Nervous sort to chatter idly (6)

I believe the answer is:

rabbit

(Other definitions for rabbit that I've seen before include "Furry, burrowing animal" , "Inferior sportsman" , "Fur; chatter (colloq.)" , "Updike's Harry Angstrom" , "Roger, Peter or Brer" .)

I've seen this clue in The Sun.

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