River - little one under which darling almost drowns (5)
I believe the answer is:
rhone
'river little one under which darling almost drowns' is the definition.
'rhone' can be an answer for 'river' (Rhone River is an example). I am not sure about the remainder of the definition.
'river little one under' is the wordplay.
'river little' becomes 'rh' (I am not sure about this - if you are sure you should believe this answer much more).
'under' is a charade indicator (letters next to each other).
'rh'+'one'='RHONE'
Can you help me to learn more?
(Other definitions for rhone that I've seen before include "River rising in Switzerland and flowing into the Mediterranean" , "Swiss-French river" , "French flower" , "River flowing from Alps to the French Med" , "French wine region" .)