One visiting stops at first by delta in Mississippi maybe (3,6)
I believe the answer is:
bus driver
'one visiting stops at first by delta in mississippi maybe' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'one visiting stops at first' is the wordplay.
'one visiting' becomes 'driver' (I can't justify this - if you can you should give a lot more credence to this answer).
'stops' becomes 'bus stops' (bus stop is a kind of stop).
'at first' means one lot of letters go next to another.
'driver' after 'bus' is 'BUS DRIVER'.
Can you help me to learn more?
(Another definition for bus driver that I've seen is " transport worker".)