Found his stable dilapidated (9)
I believe the answer is:
establish
'found' is the definition.
(found can mean to set up or establish)
'his stable dilapidated' is the wordplay.
'dilapidated' is an anagram indicator.
'his'+'stable'='hisstable'
'hisstable' with letters rearranged gives 'ESTABLISH'.
(Other definitions for establish that I've seen before include "Found - his stable (anag)" , "Set up a business or prove to be true" , "Set up or found" , "Show to be true in his stable" , "Found - institute" .)