Cryptic crossword clue
Mint copper sovereign 10

The most common and most likely answer to this crossword clue is the 10 letter word PENNYROYAL

I've seen this crossword clue in The Daily Telegraph
P
E
N
N
Y
R
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Y
A
L

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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 PENNYROYAL mean?

PENNYROYAL noun
  1. Mentha pulegium, a plant of the mint family, formerly much used in various medicinal treatments and as a flea repellent.

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