Some sampling errors remain (6)
I believe the answer is:
linger
'remain' is the definition.
(I know that linger is a kind of remain)
'some sampling errors' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'LINGER' can be found hidden inside 'sampling errors'.
(Other definitions for linger that I've seen before include "Delay departure" , "Leave slowly and hesitantly" , "Be slow to leave" , "Stay behind" , "Remain behind" .)