Crossword Genius

Mischievous and serving own interests? Not at first (6)

Ross

I believe the answer is:

elfish

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'mischievous' is the definition.
(synonyms)

I can't explain the remainder of the clue.

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(Other definitions for elfish that I've seen before include "Mischievous" , "Tricky" .)

I've seen this clue in The Times.
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