Motherly resolution to alter man? (8)

I believe the answer is:

maternal

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'motherly' is the definition.
(similar in meaning)

'resolution to alter man?' is the wordplay.
'alter man' anagrams to 'MATERNAL'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for maternal that I've seen before include "On the mother's side" , "Of a mother or motherhood" , "Protective" , "Motherly" .)

I've seen this clue in The Globe and Mail.

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