Former filling stations unopened — dedicated people sought (7)
I believe the answer is:
oblates
'dedicated people sought' is the definition.
(people dedicated to a religious order)
'former filling stations unopened' is the wordplay.
'former' becomes 'late'.
'filling' means one lot of letters goes inside another.
'stations' becomes 'jobs' (station can mean a job or position).
'unopened' means to remove the first letter.
'jobs' with its initial letter taken off is 'obs'.
'late' inserted inside 'obs' is 'OBLATES'.
(Another definition for oblates that I've seen is " Religious types".)