Behind in time — some daft error (5)
I believe the answer is:
after
'behind in time' is the definition.
(coming after)
'some daft error' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'AFTER' can be found hidden inside 'daft error'.
(Other definitions for after that I've seen before include "Searching for" , "since" , "Subsequently" , "Coming later in time" , "Behind; in quest of" .)