The most common and most likely answer to this crossword clue is the 8 letter word KERCHIEF
I've seen this crossword clue in The Guardian
K
E
R
C
H
I
E
F
More clues leading to the result KERCHIEF
Buddy explains!
The straight part
We know that "cover for crown" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cover for crown = kerchief.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 KERCHIEF mean?
KERCHIEF noun- A piece of cloth used to cover the head; a bandana.
- To cover with a kerchief.