Crossword Genius

Constantly going outside to cast vote (7)

Ross

I believe the answer is:

eternal

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

This might be a double definition.

'constantly going outside' is the first definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'cast vote' is the second definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?

'to' is the link.

Can you help me to learn more?

(Other definitions for eternal that I've seen before include "Constant" , "like Rome?" , "Forever and always" , "always to be remembered" , "unchanged by time" .)

I've seen this clue in The Guardian.
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