One having a row in unfinished part of kitchen (7)
I believe the answer is:
sculler
'one having a row' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'unfinished part of kitchen' is the wordplay.
'unfinished' means to remove the last letter.
'part of kitchen' becomes 'scullery' (I've seen this before).
'scullery' with its last letter removed is 'SCULLER'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for sculler that I've seen before include "One rowing" , "One has a row" , "22 with two blades" .)