Crossword Genius

Moderates, as is one’s wont, changing key in it (5,4)

Ross

I believe the answer is:

tones down

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'moderates' is the definition.
('tone down' can be a synonym of 'moderate')

'is one's wont changing key in it' is the wordplay.
I cannot really understand how this works, but
'one's' could be 'ones' and 'ones' is found in the answer.
'key' could be 'd' (I've seen this in other clues) and 'd' is present in the answer.
an anagram of 'wont' is 'town' which is present in the remaining letters.
No letters remain.
This may be the basis of clue (or it may be nonsense).

'as' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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