Plant provider's charge over Southeastern Railway (7)
I believe the answer is:
nursery
'plant provider's' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'charge over southeastern railway' is the wordplay.
'charge' becomes 'run'.
'over' says the letters should be written in reverse.
'southeastern' becomes 'SE'.
'railway' becomes 'ry' (abbreviation for railway).
'run' back-to-front is 'nur'.
'nur'+'se'+'ry'='NURSERY'
Can you help me to learn more?
(Other definitions for nursery that I've seen before include "Place for tending young children, or plants" , "Kindergarten" , "Baby room or where to grow plants" , "Room for small children" , "Race or place for two-year-olds" .)