The most common and most likely answer to this crossword clue is the 9 letter word ENAMELLED
I've seen this crossword clue in Independent
E
N
A
M
E
L
L
E
D
More clues leading to the result ENAMELLED
- Protected as Crown Land spoilt with melee?
- Protected online identity beginning to look a little light
- Strange tail-less male with needle-like teeth?
- Strange half-animal with needle-like teeth?
- Screamed head off about tag and put a coat on
- Tag, twice left in river, retrieved — property of a canine?
- Ignoring poll, shouted about celebrity with a glossy exterior
- Start to embellish handle and hollow counter with a glossy surface
Buddy explains!

The straight part
We know that "Protected as Crown" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case protected as crown = enamelled.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 ENAMELLED mean?
ENAMELLED verb- To coat or decorate with enamel.
- To variegate with colours, as if with enamel.
- To form a glossy surface like enamel upon.
- To disguise with cosmetics, as a woman's complexion.