Pace of horse entering American territory (6)

I believe the answer is:

canter

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'pace of horse' is the definition.
'canter' can be an answer for 'pace' (thesaurus). I am not certain of the 'of horse' bit.

'entering american territory' is the wordplay.
'entering' indicates a hidden word.
'CANTER' is hidden in the letters of 'american territory'.

Can you help me to learn more?

(Other definitions for canter that I've seen before include "Gait between a trot and a gallop" , "Move at an easy gallop" , "pace near a gallop" , "Horse movement seen in trance" , "Gentle movement in bay, say" .)

I've seen this clue in The Telegraph.

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