The most common and most likely answer to this crossword clue is the 5 letter word LABIA
L
A
B
I
A
Buddy explains!
The straight part
We know that "insect’s facial parts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case insect’s facial parts = labia.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 LABIA mean?
LABIA noun- The folds of tissue at the opening of the vulva, at either side of the vagina.
- A liplike structure; especially one of the two pairs of folds of skin either side of the vulva.
- The lip of a labiate corolla.
- The lip against which pressured air is driven to produce sound in a recorder and in a pipe organ with flue pipes.