Scrub cooker top and clean out (6)
I believe the answer is:
cancel
'scrub' is the definition.
(thesaurus)
'cooker top and clean out' is the wordplay.
'top' indicates taking the first letters.
'and' says to put letters next to each other.
'out' indicates an anagram (out can mean wrong or inaccurate).
The first letter of 'cooker' is 'c'.
'clean' with letters rearranged gives 'ancel'.
'c'+'ancel'='CANCEL'
(Other definitions for cancel that I've seen before include "Rescind, abolish" , "Annul, revoke" , "Call off (arranged event)" , "Write off" , "Cross out or annul" .)