The most common and most likely answer to this crossword clue is the 6 letter word SLINKY
I've seen this crossword clue in Financial Times
S
L
I
N
K
Y
Buddy explains!

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 SLINKY mean?
SLINKY noun- A three-dimensional curve — a spiral wound around a helix.
- Furtive, stealthy or catlike.
- Thin; lank; lean.
- Of a garment: close-fitting; clingy.