It caters for those seeking childish amusement (7)
I believe the answer is:
toyshop
'it caters' is the definition.
The definition suggests a singular noun which matches the answer.
'for those seeking childish amusement' is the wordplay.
I cannot quite see how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for toyshop that I've seen before include "Where to buy playthings" , "Source of amusements" , "outlet for childish desires?" , "Retail outlet for kids" , "store for kids" .)