Return once more with artist to where river is falling (7)
I believe the answer is:
niagara
'where river is falling' is the definition.
The definition suggests a singular noun which matches the answer.
'return once more with artist' is the wordplay.
'return' says the letters should be written backwards.
'once more' becomes 'again' ('again' can be a synonym of 'once more').
'with' is a charade indicator (letters next to each other).
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'again' written backwards gives 'niaga'.
'niaga'+'ra'='NIAGARA'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for niagara that I've seen before include "They fall in North America" , "Great falls on border of Canada and USA" , "North American waterfall" , "River linking Lakes Ontario and Erie" , "Waterfall at Iran aga" .)