Kiddie capable of smart moves (6)

I believe the answer is:

nipper

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'kiddie capable' is the definition.
I can't tell whether this definition defines the answer.

'smart moves' is the wordplay.
'smart' becomes 'nip' (both can mean a pain).
'moves' becomes 'per' (I can't explain this - if you can you should believe this answer much more).
'nip'+'per'='NIPPER'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for nipper that I've seen before include "Little chap" , "One pinches" , "Small child (informal)" , "Infant (colloq.)" , "A pincer or a young boy" .)

I've seen this clue in the Evening Standard.

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