Hid a horse around part of the US (5)

I believe the answer is:

idaho

'part of the us' is the definition.
(Idaho is a US state)

'hid a horse around' is the wordplay.
'around' indicates the answer is hidden within the clue.
'IDAHO' can be found hidden inside 'hid a horse'.

(Other definitions for idaho that I've seen before include "North-western state of America" , "North-western US state" , "US state bordering Canada" , "State of northwest US" , "silver-mining state" .)

I've seen this clue in The Mirror.

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