Writer in bed overwhelmed by endless lovemaking (6)
I believe the answer is:
scribe
'writer' is the definition.
(scribe is a kind of writer)
'bed overwhelmed by endless lovemaking' is the wordplay.
'bed' becomes 'crib' (bed for a child).
'overwhelmed by' is an insertion indicator (inserted letters get absorbed or overwhelmed).
'endless lovemaking' becomes 'se' (I can't explain this - if you can you should believe this answer much more).
'crib' going into 'se' is 'SCRIBE'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for scribe that I've seen before include "Score" , "One copied documents before the invention of printing" , "Writer of other days" , "A writer of old" , "Copyist; Jewish scholar once" .)