Step in to include the horse (5)

I believe the answer is:

pinto

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

'horse' is the definition.
(pinto is a kind of horse)

'step in to include the' is the wordplay.
'PINTO' is hidden in amongst the letters.
However, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

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

I've seen this clue in The Hindu.

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