Rowing implement (3)
'rowing implement' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oar that I've seen before include "Sweep" , "Rower's flat blade" , "I'm involved in row" , "Rowing blade" , "Rowing device" .)
(Other definitions for hoe that I've seen before include "Plymouth - -" , "Weeder" , "Gardening tool" , "Tool for loosening soil and scraping up weeds" , "Use garden tool" .)