Where Hobson's choice would not be Shanks's pony! (6)

I believe the answer is:

stable

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

'pony' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for stable that I've seen before include "Sound" , "Solid" , "Outhouse for horses" , "Products all from same place" , "Durable; horse shed" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app