Announced reason for which author Jules sees dragon (6)
I believe the answer is:
wyvern
'dragon' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for wyvern that I've seen before include "Fabulous creature" , "Heraldic winged monster" , "Heraldic beast" , "Heraldic dragon with two legs and two wings" , "Winged two-legged dragon (heraldry)" .)