Kid at party left large toy (3,4)
I believe the answer is:
rag doll
'toy' is the definition.
(I know that rag doll is a type of doll)
'kid at party left large' is the wordplay.
I cannot really see how this works, but
'kid' could be 'rag' (I've seen this in other clues) and 'rag' is found within the answer.
'party' could be 'do' (do is a kind of party) and 'do' is found within the answer.
'left' could be 'l' (common abbreviation) and 'l' is present in the answer.
'large' could be 'l' (eg in clothes sizes) and 'l' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for rag doll that I've seen before include "Long-haired cat" , "suitable gift for little girl" , "Child's toy" , "Cloth plaything" , "Child's plaything made from scraps of fabric" .)