Piece torn off? (5)

I believe the answer is:

strip

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'piece' is the definition.
(I know that strip is a type of piece)

I don't understand how the rest of the clue works.

(Other definitions for strip that I've seen before include "Ribbon" , "Landing field - take off" , "Remove (paint)" , "Series of cartoons" , "may be torn off in anger?" .)

I've seen this clue in the Evening Standard.

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