Children's verse (7,5)
I believe the answer is:
nursery rhyme
'children's verse' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for nursery rhyme that I've seen before include "may be used in infant school" , "Jack and Jill, for example" , "For example, bursary" , "Traditional children's verse" , "Traditional verse for children" .)