City’s sexual stimulant knocking six out (4)
I believe the answer is:
agra
'city's' is the definition.
(Indian city)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for agra that I've seen before include "mausoleum site" , "Taj Mahal's city" , "Foreign city" , "Not tight" , "Indian masterpiece" .)