He searches everywhere for a scrubbing-brush (7)
I believe the answer is:
scourer
'he searches everywhere for a scrubbing-brush' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is the entire clue.
Can you help me to learn more?
(Other definitions for scourer that I've seen before include "Kitchen cleaner" , "Kitchen scrubber" , "Pan cleaner" , "A cathartic" , "item of kitchen equipment" .)