Double bed artist in attendance (8)
I believe the answer is:
geminate
'double bed' is the definition.
'geminate' can be an answer for 'double' (geminating is a kind of doubling). I'm not sure about the 'bed' bit.
'artist in attendance' is the wordplay.
'artist' becomes 'emin' (I've seen this in other clues).
'in' indicates putting letters inside.
'attendance' becomes 'gate' (I've seen this before).
'emin' placed into 'gate' is 'GEMINATE'.
Can you help me to learn more?
(Other definitions for geminate that I've seen before include "Arrange in pairs" , "Like twin characters" , "Double or repeat (a speech sound); a meeting (anag.)" .)