Cryptic crossword clue
Define flying insect verbally, as required

The most common and most likely answer to this crossword clue is the 2 plus 4 plus 2 letter word IF NEED BE

I've seen this crossword clue in The Guardian
I
F
N
E
E
D
B
E

Buddy explains!

The straight part
We know that "as required" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case as required = if need be.
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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