Bus stop stalker seen regularly (7)
I believe the answer is:
shuttle
'bus' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'stop stalker seen regularly' is the wordplay.
'stop' becomes 'shut' (I can't explain this - if you can you should give a lot more credence to this answer).
'seen regularly' indicates alternate letters.
The alternate letters of 'stalker' are 'tle'.
'shut'+'tle'='SHUTTLE'
Can you help me to learn more?
(Other definitions for shuttle that I've seen before include "Transport plying back and forth" , "Transport plying to and fro" , "Transport regularly plying short route" , "Back-and-forth transport" , "Commute" .)