The most common and most likely answer to this crossword clue is the 6 letter word FLAXEN
I've seen this crossword clue in The Guardian
F
L
A
X
E
N
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 FLAXEN mean?
FLAXEN adjective- Made of or resembling flax fibers.
- A pale yellow brown; the colour of dried flax stalks and of the fiber obtained therefrom.