Set up the bed of a hare (4)

I believe the answer is:

form

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'set up' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for form that I've seen before include "Criminal record (colloq.)" , "Shape - document to be filled in" , "'Shape, bench or school class (4)'" , "A hare's hide-out" , "Configuration; type" .)

I've seen this clue in The Hindu.

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