Cryptic crossword clue
Wrongly interprets unusual smartness in dud 14

The most common and most likely answer to this crossword clue is the 14 letter word MISUNDERSTANDS

I've seen this crossword clue in The Sunday Telegraph
M
I
S
U
N
D
E
R
S
T
A
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S

Buddy explains!

The straight part
We know that "Wrongly interprets" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wrongly interprets = misunderstands.
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 MISUNDERSTANDS mean?

MISUNDERSTANDS verb
  1. To understand incorrectly, while believing one has understood correctly.

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