Run-down spot on outskirts of Dodge City (5)
I believe the answer is:
seedy
'run-down' is the definition.
(I've seen this before)
'spot on outskirts of dodge city' is the wordplay.
'spot' becomes 'see' (I've seen this in another clue).
'on' means one lot of letters go next to another.
'outskirts of dodge city' becomes 'dy' (I can't justify this - if you can you should believe this answer much more).
'see'+'dy'='SEEDY'
Can you help me to learn more?
(Other definitions for seedy that I've seen before include "Shabby and a bit dubious" , "Dilapidated" , "Like some cakes" , "Nasty and squalid" , "Down-at-heel" .)