The most common and most likely answer to this crossword clue is the 9 letter word MISTLETOE
I've seen this crossword clue in The Times
M
I
S
T
L
E
T
O
E
More clues leading to the result MISTLETOE
- Bad time to sell unfinished Yuletide hanging?
- Fine rain and shelter will be limiting to plant
- Plant stem, soil, ground, earth
- You may hang this note outside broken toilets
- Heard girl will draw plant
- Poisoner: one of ten on the way in the distance
- A hang-up about Christmas: some let it fester
- Scotch Elm I test with old parasitic growth
- Excuse to kiss TS Eliot cheekily seized by setter
- Semi to let out – it may get you a few smackers
Buddy explains!

The straight part
We know that "You may hang this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case you may hang this = mistletoe.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 MISTLETOE mean?
MISTLETOE noun- Any of several hemiparasitic evergreen plants of the order Santalales with white berries that grow in the crowns of apple trees, oaks, and other trees, such as the European mistletoe (Viscum album) and American mistletoe or eastern mistletoe (Phoradendron leucarpum).
- A sprig of one such plant used as a Christmas decoration, associated with the custom that a man may kiss any woman standing beneath it.