Grate pickle (6)
I believe the answer is:
scrape
I believe this is a double definition.
'grate' is the first definition.
(I know that grate can be written as scrape)
'pickle' is the second definition.
(I've seen this in another clue)
(Other definitions for scrape that I've seen before include "Make clean or smooth by passing hard edge across" , "What violinist does" , "jar" , "Abrasion or mischievous excapade" , "fine kettle of fish" .)