Creative genius tucked into bed, is one? (6)
I believe the answer is:
edison
'creative genius' is the definition.
(Thomas Edison was an inventor)
'tucked into bed is one?' is the wordplay.
'tucked into' indicates the answer is hidden within the clue.
'EDISON' is hidden in the letters of 'bed is one'.
(Other definitions for edison that I've seen before include "Early American inventor" , "Thomas Alva ......, great American inventor" , "US inventor of phonograph, electric light etc." , "Inventor's" , "He came up with microphone" .)