Scrub top of the cooker clean perhaps (6)
I believe the answer is:
cancel
'scrub' is the definition.
(I know that scrub can be written as cancel)
'top of the cooker clean perhaps' is the wordplay.
'top of' suggests taking the first letters.
'perhaps' indicates an anagram.
The initial letter of 'cooker' is 'c'.
'clean' with letters rearranged gives 'ancel'.
'c'+'ancel'='CANCEL'
(Other definitions for cancel that I've seen before include "Delete" , "Scrub" , "Write off" , "Officially prevent happening" , "Scrap" .)