Blanket with a hole in (6)

I believe the answer is:

poncho

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'blanket' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for poncho that I've seen before include "Blanket-like cloth with centre slit, worn as cloak" , "Overgarment with hole for head" , "Type of cloak" , "Blanket-like cloak with slit for head" , "Cape with hole for head" .)

I've seen this clue in the Evening Standard.

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