Cryptic crossword clue
Surprisingly apt study contains chapter on unknown nursery- rhyme 5-4

The most common and most likely answer to this crossword clue is the 10 letter word PATTY-CAKE

I've seen this crossword clue in Financial Times
P
A
T
T
Y
-
C
A
K
E

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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does PATTY-CAKE mean?

PATTY-CAKE noun
  1. A children's clapping game, played while reciting a rhyme about baking a cake.
  2. A cupcake or fairy cake.

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