The Pri Megadim (O.C. 690:21) says klapping for Haman is a hefsek, and discourages it for that reason. Interestingly, no other major acharonim agree. An online article I saw suggests that since klapping is a kiyum of timcheh es zeicher amalek/shem rishaim yirkav, the concern of hefsek is irrelevant.
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