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' means one lot of letters go next to another.
'river' becomes 'r' (abbreviation for river).
'oared' put after 'r' is 'ROARED'.
'and' is the link.
(Other definitions for roared that I've seen before include "Yelled" , "Made long loud sound like lion" , "Bellowed, thundered" .)