Cryptic crossword clue
Festive polka he’d danced, an unexpected turn-up 5,2,3,5

The most common and most likely answer to this crossword clue is the 18 letter word SPEAK OF THE DEVIL

I've seen this crossword clue in The Guardian
S
P
E
A
K
Â
 
O
F
Â
 
T
H
E
Â
 
D
E
V
I
L

Buddy explains!

The straight part
We know that "an unexpected turn-up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case an unexpected turn-up = speak of the devil.
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.

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