Kid attending party left large plaything (3,4)
I believe the answer is:
rag doll
'plaything' is the definition.
(rag doll is a kind of plaything)
'kid attending party left large' is the wordplay.
'kid' becomes 'rag' (both can mean to tease).
'attending' is a charade indicator (letters next to each other).
'party' becomes 'do' (do is a kind of party).
'left' becomes 'l' (common abbreviation).
'large' becomes 'L' (eg in clothes sizes).
'rag'+'do'+'l'+'l'='RAG-DOLL'
(Other definitions for rag doll that I've seen before include "Toy made with scraps of cloth etc" , "suitable gift for little girl" , "worthless toy" , "Page 3 cutie?" , "Page three girl" .)