Crossword Genius

Flier almost primeval in construction (7)

Ross

I believe the answer is:

vampire

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

This clue might be a double definition.

'flier' is the first definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'almost primeval in construction' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

Can you help me to learn more?

(Other definitions for vampire that I've seen before include "Legendary dead body that sucks blood" , "A blood-sucker like Dracula" , "Blood-sucker (bat)" , "Blood-sucking ghoul" , "fabulous creature" .)

I've seen this clue in The Sun.
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