Stir river with another river (5)
I believe the answer is:
rouse
'stir' is the definition.
(I've seen this in another clue)
'river with another river' is the wordplay.
'river' becomes 'r' (abbreviation).
'with' is a charade indicator (letters next to each other).
'another river' becomes 'ouse' (Yorkshire river. I am not sure about the 'another' bit.).
'r'+'ouse'='ROUSE'
Can you help me to learn more?
(Other definitions for rouse that I've seen before include "Get going" , "Cause to wake up and come alert" , "cause to wake or to become active" , "Disturb" , "Cause to wake up, stimulate" .)