Meter maid splitting up wordplay for "moralist” (7)

I believe the answer is:

puritan

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

I cannot understand how the remainder of the clue works.

(Other definitions for puritan that I've seen before include "Strictly moral person" , "Person of extremely strict morals" , "Dour Protestant" , "Prude" , "Adherent ot strict religous principles, opposed to sensual pleasures" .)

I've seen this clue in The Times.

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