Wash section of counter in service (5)
I believe the answer is:
rinse
'wash' is the definition.
(rinse is a kind of wash)
'section of counter in service' is the wordplay.
'section of' indicates a hidden word.
'RINSE' is hidden in the letters of 'counter in service'.
(Other definitions for rinse that I've seen before include "Swill out" , "Wash off surface dirt" , "blue one on top?" , "Remove soap with clean water" , "Wash in clean water" .)