The way a tester can be wrong (6)
I believe the answer is:
street
'the way' is the definition.
(street is a kind of way)
'a tester can be wrong' is the wordplay.
'tester' can be anagrammed to 'STREET'.
Though, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for street that I've seen before include "City road" , "Perry's Della" , "Town road" , "Somerset town; urban way" , "Way < in which common man is" .)