Crossword Genius

Dodgy bloke, one Edwina worried about? (3,3)

Ross

I believe the answer is:

bad egg

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'one edwina worried about?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'dodgy bloke' is the wordplay.
'dodgy' becomes 'bad' (I can't explain this - if you can you should believe this answer much more).
'bloke' becomes 'egg' (I've seen this in another clue).
'bad'+'egg'='BAD EGG'

Can you help me to learn more?

(Other definitions for bad egg that I've seen before include "A real stinker?" , "Worthless individual" , "wicked person?" , "Dastardly chap" , "Unpleasant person" .)

I've seen this clue in The Independent.
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