Go in for some decadent erotica (5)
I believe the answer is:
enter
'go in' is the definition.
('enter' can be a synonym of 'go in')
'some decadent erotica' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ENTER' can be found hidden inside 'decadent erotica'.
'for' is the link.
(Other definitions for enter that I've seen before include "cross the threshold" , "Gain admission" , "A key on the right" , "Join (for the first time)" , "Break in" .)