The most common and most likely answer to this crossword clue is the 6 letter word SPOKES
S
P
O
K
E
S
More clues leading to the result SPOKES
Buddy explains!

The straight part
We know that "Bars" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bars = spokes.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 SPOKES mean?
SPOKES noun- A support structure that connects the axle or the hub of a wheel to the rim.
- A projecting handle of a steering wheel.
- A rung of a ladder.
- A device for fastening the wheel of a vehicle to prevent it from turning when going downhill.
- One of the outlying points in a hub-and-spoke model of transportation.
- To furnish (a wheel) with spokes.