Get rid of some butter as expired (5)
I believe the answer is:
erase
'get rid of' is the definition.
(to erase something is to get rid of or remove it)
'some butter as expired' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'ERASE' is hidden within 'butter as expired'.
(Other definitions for erase that I've seen before include "Remove evidence of" , "Scratch" , "Rub out, expunge" , "Delete" , "score" .)