Adjusts minimal amounts of elements, including uranium in small quantities (9)

I believe the answer is:

accustoms

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'adjusts minimal amounts' is the definition.
I can't tell whether this definition defines the answer.

'elements including uranium in small quantities' is the wordplay.
'elements' becomes 'Acs' (Ac is an example).
'including' indicates putting letters inside.
'uranium in small quantities' becomes 'custom' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'acs' going around 'custom' is 'ACCUSTOMS'.

'of' is the link.

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I've seen this clue in The Guardian.

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