Bloke's accommodating ailing pony's sleepy state (8)
I believe the answer is:
hypnosis
'state' is the definition.
(hypnosis is a kind of state)
'bloke's accommodating ailing pony's sleepy' is the wordplay.
I cannot really understand how this works, but
an anagram of 'pony' is 'ypno' which is within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for hypnosis that I've seen before include "Mental state induced by suggestion" , "Means of inducing trance" , "Artificial sleep" , "Sleeplike state induced by suggestion" , "Sleeplike state in which mind responds to suggestions" .)