The most common and most likely answer to this crossword clue is the 7 plus 7 letter word SURFACE TENSION
I've seen this crossword clue in The Times
S
U
R
F
A
C
E
T
E
N
S
I
O
N
More clues leading to the result SURFACE TENSION
- Liquid runs so if retaining “A”, “X” being liquid property
- Working on US interfaces, a manifestation of liquid molecular attraction
- A water feature‘s unlikely use, for instance
- Routes finances dubiously, rendering liquid property
- Clue’s glue holds water
- It contains a little drop for this setter, working – comes up earlier
- T-square use for instance
- A gripping cryptic clue might have this hint of surprise to increase fun on cracking
- Water has a property to rise causing disquiet
Buddy explains!
The straight part
We know that "liquid property" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case liquid property = surface tension.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.