Sort date out: it confirms running order! (4,4)
I believe the answer is:
road test
'it confirms running order' is the definition.
The definition suggests a singular noun which matches the answer.
'sort date out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'sort'+'date'='sortdate'
'sortdate' anagrammed gives 'ROAD-TEST'.
Can you help me to learn more?
(Other definitions for road test that I've seen before include "A check to insure that a vehicle is fit to be driven" , "Vehicle try-out" , "Examination of vehicle's performance on highway" , "critical examination of product" , "This may confirm running order" .)