The most common and most likely answer to this crossword clue is the 5 letter word VELUM
V
E
L
U
M
Buddy explains!
The straight part
We know that "soft palate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case soft palate = velum.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 VELUM mean?
VELUM noun- A thin membrane, resembling a veil, such as:
- An accessory cloud resembling a veil extending over a large distance. Normally associated with cumulus and cumulonimbus.