The most common and most likely answer to this crossword clue is the 4 letter word GLUE
I've seen this crossword clue in The Daily Telegraph
G
L
U
E
More clues leading to the result GLUE
- Stick contents of bulges out
- Gel's used regularly as binding material
- This size, OS, is not right for OU gels
- Unhappy as book’s swapped for good adhesive
- Stick leg out covering middle of rug
- Note student regularly uses gum
- Stick with sled that’s good going west
- Bond, an agent with sticking power
- Paste menu’s logo evenly over displays
- St. Moritz sport with good climbing stick
Buddy explains!

The straight part
We know that "Paste" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case paste = glue.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 GLUE mean?
GLUE noun- A hard gelatin made by boiling bones and hides, used in solution as an adhesive; or any sticky adhesive substance.
- Anything that binds two things or people together.
- Birdlime.
- To join or attach something using glue.
- To cause something to adhere closely to; to follow attentively.