Couch potato's back, enthralled by naked divers (7)

I believe the answer is:

lounger

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand the rest of the clue.

(Other definitions for lounger that I've seen before include "Comfortable couch" , "Light couch" , "Relax on this" , "Casual coat" , "Comfortable seat" .)

I've seen this clue in The Independent.

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