Get up around noon for wash (5)
I believe the answer is:
rinse
'for wash' is the definition.
(synonyms)
'get up around noon' is the wordplay.
'get up' becomes 'rise' (synonyms).
'around' indicates putting letters inside.
'noon' becomes 'n' (abbreviation for noon).
'rise' enclosing 'n' is 'RINSE'.
(Other definitions for rinse that I've seen before include "Flush" , "Wash in clean water" , "Run water through" , "Wash - siren (anag)" , "Remove soap with clean water" .)