He inspects buildings finding ours very poor (8)
I believe the answer is:
surveyor
'he inspects buildings' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'ours very poor' is the wordplay.
'poor' indicates an anagram.
'ours'+'very'='oursvery'
'oursvery' with letters rearranged gives 'SURVEYOR'.
'finding' acts as a link.
Can you help me to learn more?
(Other definitions for surveyor that I've seen before include "Engineer who provides map-making data" , "Person who examines the condition of land and buildings" , "Land or building measurer" , "Building inspector" , "See 1 across" .)