So a new toy is a puppet (5)
I believe the answer is:
sooty
'is a puppet' is the definition.
I can't judge whether this definition defines the answer.
'so a new toy' is the wordplay.
'a new' indicates an anagram.
'toy' with letters rearranged gives 'oty'.
'so'+'oty'='SOOTY'
Can you help me to learn more?
(Other definitions for sooty that I've seen before include "Blackened; -- tern" , "Hand-puppet TV bear" , "4 [BEAR]" , "TV glove puppet" , "Covered in black dust" .)