Cheeky girl, at least ten (4)

I believe the answer is:

minx

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'cheeky girl' is the definition.
(I've seen this before)

'least ten' is the wordplay.
'least' becomes 'min' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ten' becomes 'X' (Roman numeral).
'min'+'x'='MINX'

'at' is the link.

Can you help me to learn more?

(Other definitions for minx that I've seen before include "miss making mischief" , "Impudent flirtatious girl" , "Alluring female" , "Flirt" , "Boldly flirtatious young woman" .)

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