Crossword Genius

Period that's long when sitting on pole (4)

Ross

I believe the answer is:

year

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'period' is the definition.
(I know that year is a type of period)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for year that I've seen before include "365 or 366 days" , "Twelvemonth" , "Pupil group" , "Student group" , "Four seasons" .)

I've seen this clue in The Irish Times.
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