Crossword Genius

Persist as a mythical reptile (6)

Ross

I believe the answer is:

dragon

I'm a little stuck... Click here to teach me more about this clue!

'mythical reptile' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for dragon that I've seen before include "Creature of Teutonic mythology" , "It's red on the Welsh flag" , "particularly intimidating woman" , "Fiery monster" , "Continue interminably" .)

I've seen this clue in The Mirror.
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