Crossword Genius

Spotted a naughty elf coming to a wicked end (7)

Ross

I believe the answer is:

flecked

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'spotted' is the definition.
('fleck' can be a synonym of 'spot')

'a naughty elf coming to a wicked end' is the wordplay.
I cannot quite see how this works, but
an anagram of 'elf' is 'fle' which is present in the answer.
This may be the basis of clue (or it may be nonsense).

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