Hiding in bedroom, an invisible Arab (5)
I believe the answer is:
omani
'arab' is the definition.
(Omani is an example)
'hiding in bedroom an invisible' is the wordplay.
'hiding' indicates a hidden word.
'OMANI' can be found hidden inside 'in bedroom an invisible'.
(Other definitions for omani that I've seen before include "Gulf native" , "Inhabitant of Middle Eastern sultanate" , "Middle East national" , "One from Muscat" , "Middle Easterner" .)