This holds cat Ronnie groomed (9)
I believe the answer is:
container
'this holds' is the definition.
The definition suggests a singular noun which matches the answer.
'cat ronnie groomed' is the wordplay.
'groomed' indicates an anagram (letters groomed or tidied up).
'cat'+'ronnie'='catronnie'
'catronnie' anagrammed gives 'CONTAINER'.
Can you help me to learn more?
(Other definitions for container that I've seen before include "Large box for transporting goods" , "tin can, say?" , "Receptacle" , "Large shipping box" , "Something to hold" .)