Drop off developer by The Bank (5)
I believe the answer is:
levee
'bank' is the definition.
(I know that levee is a type of embankment)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for levee that I've seen before include "Morning reception once held by monarch" , "Retaining embankment" , "Early morning reception by a monarch" , "Riverside embankment" , "Flood embankment" .)