They have a case for those seeking a rise (6)

I believe the answer is:

stairs

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'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps you can see an association between them that I don't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for stairs that I've seen before include "Means of ascent/descent" , "Way between floors" , "Access consisting of steps" , "Interior means of ascent" , "4 and 8 (to the cockney)" .)

I've seen this clue in The Irish Independent.

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