Rub out; remove (5)
I believe the answer is:
erase
This clue is a double definition.
'rub out' is the first definition.
(synonyms)
'remove' is the second definition.
(to erase is to remove)
(Other definitions for erase that I've seen before include "Remove, wipe out" , "score" , "Remove from memory" , "Destroy recording on audio or video tape" , "Kill" .)