Opportunities to employ court professionals (7)
I believe the answer is:
doctors
'professionals' is the definition.
(doctor is a kind of professional)
'opportunities to employ court' is the wordplay.
'opportunities' becomes 'doors' ('as one door closes, another opens').
'to employ' means one lot of letters goes inside another.
'court' becomes 'ct' (abbreviation used in road names).
'doors' going around 'ct' is 'DOCTORS'.
(Other definitions for doctors that I've seen before include "consultants" , "Highly qualified academics" , "fixes" , "Alters" , "Medical practitioners" .)