Piece angrily torn off (5)
I believe the answer is:
strip
'piece' is the definition.
(strip is a kind of piece)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for strip that I've seen before include "Landing field - take off" , "Remove covering from" , "Tear off" , "Series of cartoons" , "Undress (provocatively)" .)