Get rid of last of the pickle (6)
I believe the answer is:
scrape
'pickle' is the definition.
(thesaurus)
'get rid of last of the' is the wordplay.
'get rid of' becomes 'scrap' (I've seen this before).
'last of' says to take the final letters.
The final letter of 'the' is 'e'.
'scrap'+'e'='SCRAPE'
(Other definitions for scrape that I've seen before include "Fix - grate" , "play the fiddle" , "Grate - predicament" , "Scratch; just make (living)" , "Grate; graze" .)