The most common and most likely answer to this crossword clue is the 6 plus 4 letter word CATTLE GRID
I've seen this crossword clue in The Times
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Buddy explains!
The straight part
We know that "Bars to limit stock" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bars to limit stock = cattle grid.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 CATTLE GRID mean?
CATTLE GRID noun- A grid of parallel metal bars designed as an obstacle to prevent hooved animals from passing.