Go down to seedy club (4)
I believe the answer is:
dive
This clue is a double definition.
'go down' is the first definition.
(I know that dive is a more specific form of the action submerge)
'seedy club' is the second definition.
'to' acts as a link.
(Other definitions for dive that I've seen before include "sleazy bar" , "Headlong plunge into water" , "Plunge - seedy club" , "Joint" , "Jump into pool" .)