Grate pickle (6)
I believe the answer is:
scrape
This clue 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 before)
(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" .)