Little Bo-Peep is cursory, for one? (7,5)
I believe the answer is:
nursery rhyme
'little bo-peep' is the definition.
The definition suggests a singular noun which matches the answer.
'cursory for one?' is the wordplay.
I cannot quite understand how this works, but
'one?' could be 'me' (a setter might use 'one' to humourously mean 'me') and 'me' is located in the answer.
This explanation may well be incorrect...
'is' acts as a link.
Can you help me to learn more?
(Other definitions for nursery rhyme that I've seen before include "Traditional children's verse" , "may be used in infant school" , "For example, bursary" , "Children's poem" , "Traditional verse for children" .)