Heraldic symbol of French depravity (6)

I believe the answer is:

device

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'heraldic symbol' is the definition.
'device' can be an answer for 'symbol' (thesaurus). I am not sure about the 'heraldic' bit.

'of french depravity' is the wordplay.
'of french' becomes 'de' ('of' in French).
'depravity' becomes 'vice' (moral depravity).
'de'+'vice'='DEVICE'

Can you help me to learn more?

(Other definitions for device that I've seen before include "Gadget, tool, piece of equipment" , "Gadget made for particular purpose" , "bomb?" , "Trick; heraldic design" , "Heraldic emblem" .)

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

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