Endless end assumed, assuming rising misery (7)

I believe the answer is:

sadness

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

'misery' is the definition.
(thesaurus)

'endless end assumed assuming rising' is the wordplay.
'SADNESS' is hidden back-to-front in amongst the letters.
However, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for sadness that I've seen before include "Depression" , "Misery" , "Melancholy" , "regret" , "Grief" .)

I've seen this clue in The Telegraph.

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