Key in once more (6)
I believe the answer is:
retype
'key in once more' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for retype that I've seen before include "Produce amended" , "Produce document again" , "Set (the same text) again on a word processor" , "Key in again" , "Tap out again on keyboard" .)