Sweeper needed by Porto, arguably (3)
I believe the answer is:
oar
'sweeper' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'needed by porto arguably' is the wordplay.
'needed by' says the answer is hidden in the clue (the solution letters are needed to write the clue).
'OAR' is hidden within 'porto arguably'.
Can you help me to learn more?
(Other definitions for oar that I've seen before include "Rower's paddle" , "Bladed implement" , "Pusher" , "Pole for rowing" , "Propelling blade" .)