Use keys again — for some surety, perhaps (6)
I believe the answer is:
retype
'use keys again' is the definition.
(type with a keyboard again)
'some surety perhaps' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'RETYPE' is hidden in the letters of 'surety perhaps'.
'for' acts as a link.
(Other definitions for retype that I've seen before include "Set (the same text) again on a word processor" , "Produce amended" , "made to revise earlier draft perhaps" , "Key in again" , "Repeat work in pool" .)