Cop guarding god leaving hospital in Texas city (6)
I believe the answer is:
dallas
'texas city' is the definition.
(city in Texas)
'cop guarding god leaving hospital in' is the wordplay.
'cop guarding' becomes 'ds' (I can't explain this - if you can you should believe this answer much more).
'god' becomes 'allah' (Arabic name for God).
'leaving' suggests deleting specific letters.
'hospital' becomes 'h' (abbreviation for hospital on maps).
'in' indicates putting letters inside.
'allah' with 'h' taken away is 'alla'.
'ds' placed around 'alla' is 'DALLAS'.
(Other definitions for dallas that I've seen before include "Texas city - old soap" , "oil centre" , "City where JF Kennedy was assassinated" , "assassination site" , "former TV series" .)