One uses it single-handed (5)
I believe the answer is:
scull
This might be a double definition.
'one' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'it single-handed' is the second definition.
The definition suggests a singular noun which matches the answer.
'uses' acts as a link.
Can you help me to learn more?
(Other definitions for scull that I've seen before include "Small oar" , "racing shell" , "Light rowing boat" , "Row with two oars" , "A single oar" .)