Paddle over a river (3)
I believe the answer is:
oar
'paddle' is the definition.
(I've seen this in another clue)
'over a river' is the wordplay.
'over' becomes 'o' (cricket abbreviation).
'river' becomes 'r' (abbreviation for river).
'o'+'a'+'r'='OAR'
(Other definitions for oar that I've seen before include "propels floating craft" , "Rowing blade" , "that may be feathered?" , "Propelling pole" , "Bladed implement" .)