Animal I found in dilapidated stable (7)
I believe the answer is:
bestial
'animal' is the definition.
(I've seen this before)
'i found in dilapidated stable' is the wordplay.
'found in' indicates putting letters inside.
'dilapidated' indicates anagramming the letters.
'stable' is an anagram of 'bestal'.
'i' placed within 'bestal' is 'BESTIAL'.
(Other definitions for bestial that I've seen before include "Animal-like" , "Savage" , "Brutish or cruel, hardly human" , "Like an animal; depraved" , "Tables I create, being brutal or cruel" .)