Crossword Genius

Raging king of the insect world? (6,7)

Ross

I believe the answer is:

purple emperor

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'world?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'raging king of the insect' is the wordplay.
'raging king of' becomes 'purple' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'the insect' becomes 'emperor' (emperor is a kind of insect).
'purple'+'emperor'='PURPLE EMPEROR'

Can you help me to learn more?

(Other definitions for purple emperor that I've seen before include "One flapping about" , "Flyer" , "European butterfly" , "Insect" , "Butterfly (appropriately coloured)" .)

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