Get out of bed about noon to wash (5)
I believe the answer is:
rinse
'wash' is the definition.
(rinse is a kind of wash)
'get out of bed about noon' is the wordplay.
'get out of bed' becomes 'rise' ('rise' can be a synonym of 'get out of bed').
'about' is an insertion indicator.
'noon' becomes 'n'.
'rise' going around 'n' is 'RINSE'.
'to' acts as a link.
(Other definitions for rinse that I've seen before include "Wash in clean water" , "Wash off surface dirt" , "Wash lightly without soap" , "Swill out" , "blue one on top?" .)