Crossword Genius

Extremely long sort of year! (5)

Ross

I believe the answer is:

light

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This could be a double definition.

'extremely long sort' is the first definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'year' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for light that I've seen before include "Radiance" , "not overburdened" , "Not dark; not heavy" , "Mild" , "Illumination - not serious!" .)

I've seen this clue in the Evening Standard.
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