Removal time guaranteed (7)
I believe the answer is:
erasure
'removal' is the definition.
(I know that erasure is a type of deletion)
'time guaranteed' is the wordplay.
'time' becomes 'era' (era is a kind of time).
'guaranteed' becomes 'sure' (I've seen this in other clues).
'era'+'sure'='ERASURE'
(Other definitions for erasure that I've seen before include "Obliteration of data" , "Rubbing out - English synthpop duo" , "Effect of surface damage" , "clearing of tape" , "Process of rubbing out" .)