Cryptic crossword clue
What’s not true, you see, starts with Boris around, by the look of him? 5,5

The most common and most likely answer to this crossword clue is the 5 plus 5 letter word FAIRY STORY

I've seen this crossword clue in The Guardian
F
A
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R
Y
S
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Y

Buddy explains!

The straight part
We know that "What’s not true" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what’s not true = fairy story.
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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