Cryptic crossword clue
Loose rock needs new barrier 6

The most common and most likely answer to this crossword clue is the 6 letter word SCREEN

I've seen this crossword clue in The Guardian
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The straight part
We know that "barrier" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case barrier = screen.
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 SCREEN mean?

SCREEN noun
  1. A physical divider intended to block an area from view, or provide shelter from something dangerous.
  2. A material woven from fine wires intended to block animals or large particles from passing while allowing gasses, liquids and finer particles to pass.
  3. (by analogy) Searching through a sample for a target; an act of screening
  4. Various forms or formats of information display
  5. Definitions related to standing in the path of an opposing player
  6. An erection of white canvas or wood placed on the boundary opposite a batsman to make the ball more easily visible.
  7. A collection of less-valuable vessels that travel with a more valuable one for the latter's protection.
  8. A dwarf wall or partition carried up to a certain height for separation and protection, as in a church, to separate the aisle from the choir, etc.
  9. A large scarf.
SCREEN verb
  1. To filter by passing through a screen.
  2. To shelter or conceal.
  3. To remove information, or censor intellectual material from viewing.
  4. To present publicly (on the screen).
  5. To fit with a screen.
  6. To examine patients or treat a sample in order to detect a chemical or a disease, or to assess susceptibility to a disease.
  7. To search chemical libraries by means of a computational technique in order to identify chemical compounds which would potentially bind to a given biological target such as a protein.
  8. To stand so as to block a defender from reaching a teammate.
  9. To determine the source or subject matter of a call before deciding whether to answer the phone.

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