The most common and most likely answer to this crossword clue is the 8 letter word SPACKLED
S
P
A
C
K
L
E
D
Buddy explains!
The straight part
We know that "plastered" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plastered = spackled.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 SPACKLED mean?
SPACKLED verb- To fill or repair with a plastic paste.
- To fill cracks or holes with a spackle.
- To fill gaps with something, as if spackling; to speckle