Official can be very sour (8)
I believe the answer is:
surveyor
'official' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'can be very sour' is the wordplay.
'can be' indicates anagramming the letters.
'very'+'sour'='verysour'
'verysour' is an anagram of 'SURVEYOR'.
Can you help me to learn more?
(Other definitions for surveyor that I've seen before include "Examiner and map-maker of lands and buildings" , "Official inspector" , "See 1 across" , "One determines boundaries, elevations etc" , "Land or building measurer" .)