Dragon questioning the choice of Vernon, we hear (6)

I believe the answer is:

wyvern

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'dragon' is the definition.
(I know that wyvern is a type of dragon)

I don't understand the remainder of the clue.

(Other definitions for wyvern that I've seen before include "Winged two-legged dragon (heraldry)" , "Heraldic winged monster" , "Heraldic beast" , "Heraldic dragon with two legs and two wings" , "Heraldic form of dragon" .)

I've seen this clue in The Daily Express.

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