Crossword Genius

Butterfly's innocent officer (5,7)

Ross

I believe the answer is:

white admiral

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'butterfly's' is the definition.
(white admiral is a kind of butterfly)

'innocent officer' is the wordplay.
'innocent' becomes 'white' (I can't justify this - if you can you should believe this answer much more).
'officer' becomes 'admiral' (admiral is a kind of officer).
'white'+'admiral'='WHITE ADMIRAL'

Can you help me to learn more?

(Other definitions for white admiral that I've seen before include "Describing doctor's oath" , "Butterfly - with a Daimler (anag)" .)

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