Covering for a broken arm (7,4)

I believe the answer is:

plaster cast

(Other definitions for plaster cast that I've seen before include "Protection for broken limbs etc" , "Copy made by pouring mixture into a mould - art class pet (anag)" , "Copy of an object made in a mould" , "Aid to bone-setting" , "sign of a break" .)

I've seen this clue in the Newsday.

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