The way to confuse a tester (6)
I believe the answer is:
street
'the way' is the definition.
(street is a kind of way)
'confuse a tester' is the wordplay.
'confuse' indicates anagramming the letters.
'tester' with letters rearranged gives 'STREET'.
'to' acts as a link.
(Other definitions for street that I've seen before include "Thoroughfare lined with buildings" , "Road lined with houses" , "Urban thoroughfare" , "Road lined with buildings" , "Built-up road" .)