Let client change one's mind (9)

I believe the answer is:

intellect

I'm a little stuck... Click here to teach me more about this clue!

'one's mind' is the definition.
'intellect' can be an answer for 'mind' (synonyms). I am not sure about the 'one's' bit.

'let client change' is the wordplay.
'change' is an anagram indicator.
'let'+'client'='letclient'
'letclient' anagrammed gives 'INTELLECT'.

Can you help me to learn more?

(Other definitions for intellect that I've seen before include "Brain" , "Reason" , "Mental powers; clever person" , "Power of the mind" , "Faculty of reasoning" .)

I've seen this clue in the Sydney Morning Herald.

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