The most common and most likely answer to this crossword clue is the 5 letter word BEARD
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More clues leading to the result BEARD
Buddy explains!

The straight part
We know that "facial hair" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case facial hair = beard.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 BEARD mean?
BEARD noun- Facial hair on the chin, cheeks, jaw and neck.
- The cluster of small feathers at the base of the beak in some birds.
- The appendages to the jaw in some cetaceans, and to the mouth or jaws of some fishes.
- The byssus of certain shellfish.
- The gills of some bivalves, such as the oyster.
- In insects, the hairs of the labial palpi of moths and butterflies.
- Long or stiff hairs on a plant; the awn.
- A barb or sharp point of an arrow or other instrument, projecting backward to prevent the head from being easily drawn out.
- The curved underside of an axehead, extending from the lower end of the cutting edge to the axehandle.
- That part of the underside of a horse's lower jaw which is above the chin, and bears the curb of a bridle.
- That part of a type which is between the shoulder of the shank and the face.
- A fake customer or companion, especially a woman who accompanies a gay man in order to give the impression that he is heterosexual.
- To grow hair on the chin and jaw.
- To boldly and bravely oppose or confront, often to the chagrin of the one being bearded.
- To take by the beard; to seize, pluck, or pull the beard of (a man), in anger or contempt.
- To deprive (an oyster or similar shellfish) of the gills.
- Of a gay man or woman: to accompany a gay person of the opposite sex in order to give the impression that they are heterosexual.