Got ascendent sorted - that's a relief (12)

I believe the answer is:

decongestant

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

'got ascendent sorted' is the wordplay.
'sorted' indicates an anagram.
'got'+'ascendent'='gotascendent'
'gotascendent' with letters rearranged gives 'DECONGESTANT'.

'that's' is the link.

Can you help me to learn more?

(Other definitions for decongestant that I've seen before include "Catarrh reliever" , "Medicine clearing airways" , "Medicine to unblock the nose" , "cold remedy" .)

I've seen this clue in The Daily Express.

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