Zealots rehash centrists' greeting (5)

I believe the answer is:

aloha

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

I cannot understand how the rest of the clue works.

(Other definitions for aloha that I've seen before include "greeting in Oahu" , "A greeting in Hawaii" , "Hawaiian "ciao"" , "A Polynesian hello or goodbye" , "A Hawaiian welcome" .)

I've seen this clue in The Irish Times.

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