Not much like Bo-Peep? (6)
I believe the answer is:
little
'not much' is the definition.
(a small amount)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for little that I've seen before include "'Every ...... helps" , "younger" , "Tell it (anag) - not a lot!" , "Piddling" , "The Battle of ... Bighorn, Custer's last stand" .)