Crossword Genius

Class length (6)

Ross

I believe the answer is:

league

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This might be a double definition.

'class' is the first definition.
(I've seen this before)

'length' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

Can you help me to learn more?

(Other definitions for league that I've seen before include "Combination of groups for a purpose, sports clubs perhaps" , "Association - old measure of distance" , "Old measure of distance, about 3 miles" , "Association of states or sports teams" , "Competing group of clubs" .)

I've seen this clue in The Independent and the King Feature Syndicate.
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