From a toilet water is rising (6)

I believe the answer is:

ascent

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'is rising' is the definition.
(thesaurus)

'from a toilet water' is the wordplay.
'from' becomes 'a' (I can't justify this - if you can you should give a lot more credence to this answer).
'a toilet water' becomes 'scent' (toilet water is a type of perfume).
'a'+'scent'='ASCENT'

Can you help me to learn more?

(Other definitions for ascent that I've seen before include "Act of moving upwards" , "Enacts in climb" , "Alpine expedition" , "A rise in status; climb" , "Stance (anag)" .)

I've seen this clue in The Telegraph.

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