In heraldry, a dragon-like creature with two legs (6)

I believe the answer is:

wyvern

(Other definitions for wyvern that I've seen before include "Heraldic form of dragon" , "Heraldic winged monster" , "Heraldic beast" , "In heraldry, a dragon with wings, two legs and a barbed tail" , "Heraldic device" .)

I've seen this clue in The Sunday Times and The Times.

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