The most common and most likely answer to this crossword clue is the 14 letter word CIRCUMNAVIGATE
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More clues leading to the result CIRCUMNAVIGATE
Buddy explains!

The straight part
We know that "Perhaps fly round" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case perhaps fly round = circumnavigate.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 CIRCUMNAVIGATE mean?
CIRCUMNAVIGATE verb- To travel completely around somewhere or something, especially by sail.
- To circumvent or bypass.
- To sail around the world.