New toy did strange thing (6)
I believe the answer is:
oddity
'strange thing' is the definition.
'new toy did' is the wordplay.
'new' indicates an anagram.
'toy'+'did'='toydid'
'toydid' anagrammed gives 'ODDITY'.
(Other definitions for oddity that I've seen before include "one's mathematical quality?" , "David Bowie's Space ___" , "Curious thing" , "Something strange or eccentric" , "Unusual thing" .)