The most common and most likely answer to this crossword clue is the 8 letter word TONICITY
I've seen this crossword clue in Financial Times
T
O
N
I
C
I
T
Y
Buddy explains!

The straight part
We know that "desirable bodily feature" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case desirable bodily feature = tonicity.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 TONICITY mean?
TONICITY noun- The normal presence of tone or tension in a muscle or organ; tonus
- The ability of a solution to exert an osmotic pressure upon a membrane