Annoy a court, not very careful about details (5)
I believe the answer is:
exact
'annoy a court not very careful about details' is the definition.
I can't tell whether this definition defines the answer.
'annoy a court' is the wordplay.
'annoy' becomes 'ex' (I can't explain this - if you can you should believe this answer much more).
'court' becomes 'ct' (abbreviation used in road names).
'ex'+'a'+'ct'='EXACT'
Can you help me to learn more?
(Other definitions for exact that I've seen before include "As a right, demand" , "Meticulous" , "Demand, extort" , "Not approximate, precise" , "on the money" .)