The most common and most likely answer to this crossword clue is the 9 letter word SHROUDING
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Buddy explains!

The straight part
We know that "covering" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case covering = shrouding.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.
Crossword Answer definitions
SHROUDING verb- To cover with a shroud.
- To conceal or hide from view, as if by a shroud.
- To take shelter or harbour.
- To lop the branches from (a tree).
- A shroud (annular plate at the periphery of a water wheel, forming side of bucket).