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Tortuously agonise with clue involving hours seated here? (6,6)

Ross

I believe the answer is:

chaise longue

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'tortuously agonise with clue involving hours seated here?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

This is the entire clue.

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(Other definitions for chaise longue that I've seen before include "Type of sofa" , "Sofa for reclining on" , "Reclining seat with back and armrest" , "Partly backed couch with one arm" .)

I've seen this clue in The Times.
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