Make lines on paper that child can play with (3,4)
I believe the answer is:
rag doll
'that child can play with' is the definition.
(children's toy)
'make lines on paper' is the wordplay.
I cannot really understand how this works, but
'make' could be 'do' (synonyms) and 'do' is found within the answer.
'lines' could be 'll' (two abbreviations for line) and 'll' is present in the answer.
'paper' could be 'rag' (rag paper is a kind of paper) and 'rag' is found in the answer.
No letters remain.
This explanation may well be incorrect...
(Other definitions for rag doll that I've seen before include "plaything's required" , "Page three girl" , "Child's toy" , "Page 3 cutie?" , "Child's plaything made from scraps of fabric" .)