Crossword Genius

Also trim pieces composed by person aiming to regulate others' behaviour (8)

Ross

I believe the answer is:

moralist

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'person aiming to regulate others' behaviour' is the definition.
I can't judge whether this defines the answer.

'also trim pieces' is the wordplay.
'pieces' indicates anagramming the letters (the same pieces in a new order).
'also'+'trim'='alsotrim'
'alsotrim' with letters rearranged gives 'MORALIST'.

'composed by' is the link.

Can you help me to learn more?

(Other definitions for moralist that I've seen before include "Good teacher" , "someone drawing lessons" , "preacher" , "Disciplinarian" , "Ail storm (anag)" .)

I've seen this clue in The Irish Times.
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