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Blade given jerk, repelling butterfly (7)

Ross

I believe the answer is:

vanessa

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'butterfly' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'blade given jerk repelling' is the wordplay.
'blade' becomes 'vane' (synonyms).
'given jerk' becomes 'ass' (I've seen this in another clue. I am not sure about the 'given' bit.).
'repelling' says the letters should be written backwards.
'ass' reversed gives 'ssa'.
'vane'+'ssa'='VANESSA'

Can you help me to learn more?

(Other definitions for vanessa that I've seen before include "Girl's name - butterfly genus" , "Girl's name; red admiral, painted lady genus" , "Red admiral butterfly" .)

I've seen this clue in the Sydney Morning Herald.
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