For which Topsy would have given both pence and shillings? (3)
I believe the answer is:
toy
'for which topsy would have given both pence and shillings?' is the definition.
The definition suggests a singular noun which matches the answer.
'for which' is the wordplay.
'for' becomes 'to' (eg both can mean 'in the opinion of').
'which' becomes 'y' (I can't justify this - if you can you should believe this answer much more).
'to'+'y'='TOY'
Can you help me to learn more?
(Other definitions for toy that I've seen before include "Child's amusement" , "Doll or teddy, say" , "Miniature (dog)" , "A child's plaything" , "Trifle with plaything?" .)