Cats heard in the stable yard perhaps (4)
I believe the answer is:
mews
'cats heard in the stable' is the definition.
I can't judge whether this defines the answer.
'yard perhaps' is the wordplay.
'yard' becomes 'M' (synonyms).
'perhaps' becomes 'ews' (I can't justify this - if you can you should believe this answer much more).
'm'+'ews'='MEWS'
Can you help me to learn more?
(Other definitions for mews that I've seen before include "Group of former stables converted into homes" , "occupied dwellings that used to be stables" , "House converted from stables" , "Ex-stable block" , "Street or yard with stables converted into houses" .)