Just the horse to nip around with? (5)

I believe the answer is:

pinto

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'just the horse' is the definition.
I can't judge whether this defines the answer.

'to nip around with?' is the wordplay.
'to nip' anagrams to 'PINTO'.
However, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for pinto that I've seen before include "Spotted or piebald horse" , "H [HORSE]" , "patchy horse" , "Piebald horse (US)" , "A piebald pony" .)

I've seen this clue in the Evening Standard.

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