Free to talk like stabled horse (9)
I believe the answer is:
unbridled
'free' is the definition.
(thesaurus)
'talk like stabled horse' is the wordplay.
I cannot quite see how this works, but
'talk' could be 'idle' (idle talk is a kind of talk) and 'idle' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for unbridled that I've seen before include "Fully and freely" , "Without restraint, as horse may be" , "Without constraint" , "Unrestrained" , "Not restrained or controlled" .)