Give up new plan editor dismissed (6)
I believe the answer is:
resign
'give up' is the definition.
(I know that give up can be written as resign)
'new plan editor dismissed' is the wordplay.
'new plan' becomes 'redesign' (an additional plan or design).
'editor' becomes 'ed' (abbreviation).
'dismissed' indicates named letters should be taken away.
'redesign' with 'ed' taken out is 'RESIGN'.
(Other definitions for resign that I've seen before include "advice for the incompetent?" , "Give up one's post" , "Stand down" , "Give up one's job" , "Turn over" .)