The most common and most likely answer to this crossword clue is the 11 plus 5 letter word UPSIDE-DOWN CAKES
I've seen this crossword clue in Financial Times
U
P
S
I
D
E
-
D
O
W
N
C
A
K
E
S
More clues leading to the result UPSIDE-DOWN CAKES
Buddy explains!
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.