Shouted and paddled behind river (6)
I believe the answer is:
roared
'shouted' is the definition.
(roaring is a kind of shouting)
'paddled behind river' is the wordplay.
'paddled' becomes 'oared' (I've seen this in another clue).
'behind' is a charade indicator (letters next to each other).
'river' becomes 'r' (abbreviation).
'oared' put after 'r' is 'ROARED'.
'and' acts as a link.
(Other definitions for roared that I've seen before include "Yelled" , "Made long loud sound like lion" , "Bellowed, thundered" .)