Poor actor to make jokes about in bed (7)
I believe the answer is:
hammock
'bed' is the definition.
(hammock is a kind of bed)
'poor actor to make jokes about' is the wordplay.
'poor actor' becomes 'ham' (ham can mean a bad or over-the-top actor).
'to make jokes about' becomes 'mock' (to mock something is to make jokes about it).
'ham'+'mock'='HAMMOCK'
'in' is the link.
(Other definitions for hammock that I've seen before include "Bed tied between trees?B" , "Sailor's bed of ropes and canvas" , "Bed (for swingers?)" , "String bed" , "Hanging cloth bed" .)