This moth could be called a butterfly (7)
I believe the answer is:
emperor
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" .)