Crossword Genius

Offensive person’s secure trade to grab everything (8)

Ross

I believe the answer is:

hedgehog

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'offensive person's secure trade' is the definition.
I can't tell whether this defines the answer.

'to grab everything' is the wordplay.
'to' becomes 'hedge' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'grab everything' becomes 'hog' (I've seen this in another clue).
'hedge'+'hog'='HEDGEHOG'

Can you help me to learn more?

(Other definitions for hedgehog that I've seen before include "Urchin" , "Nocturnal mammal" , "Spiny mammal" , "Prickly mammal" , "Prickly rodent" .)

I've seen this clue in The Independent.
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