The most common and most likely answer to this crossword clue is the 6 letter word PLAITS
I've seen this crossword clue in Financial Times
P
L
A
I
T
S
Buddy explains!

The straight part
We know that "Features of Barnet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case features of barnet = plaits.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 PLAITS mean?
PLAITS noun- A flat fold; a doubling, as of cloth; a pleat.
- A braid, as of hair or straw; a plat.
- To fold; to double in narrow folds; to pleat
- To interweave the strands or locks of; to braid