Clue: Surprisingly apt study contains chapter on unknown nursery- rhyme (5-4)
Answer: PATTY-CAKE
Explanation: Surprisingly apt study contains chapter on unknown nursery- rhyme (5-4)
 
(*apt) +T(Y + C)AKE
 
*Patty cake, patty cake, baker's man.*
 
*Bake me a cake as fast as you can;*
 
*Roll it up, roll it up;*
 
*And throw it in a pan!*
 
*Patty cake, patty cake, baker's man