Crossword Genius

This moth could be called a butterfly (7)

Ross

I believe the answer is:

emperor

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'this moth could be called a' is the first definition.
'emperor' can be an answer for 'moth' (emperor is a kind of moth). I am not sure about the rest of the definition.

'butterfly' is the second definition.
(I know that emperor is a type of brush-footed butterfly)

Can you help me to learn more?

(Other definitions for emperor that I've seen before include "A moth; a penguin" , "Napoleon Bonaparte, for instance" , "Large richly coloured butterfly" , "Ruler of large territory" , "Penguin of largest known species - a great ruler" .)

I've seen this clue in The Globe and Mail.
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