The most common and most likely answer to this crossword clue is the 8 letter word OVERLAID
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More clues leading to the result OVERLAID
Buddy explains!

The straight part
We know that "Covered" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case covered = overlaid.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 OVERLAID mean?
OVERLAID verb- To lay, spread, or apply something over or across; cover.
- To overwhelm; to press excessively upon.
- To lie over (someone, especially a child) in order to smother it; to suffocate.
- To put an overlay on.