Arranged in advance, gift's not new (6)
I believe the answer is:
preset
'arranged in advance' is the definition.
(I've seen this before)
'gift's not new' is the wordplay.
'gift' becomes 'present' (present is a kind of gift).
'not' indicates named letters should be taken away.
'new' becomes 'n'.
'present' with 'n' removed is 'PRESET'.
(Other definitions for preset that I've seen before include "Arranged in advance" , "adjusted beforehand" , "Initially adjust" , "Determined beforehand" , "Adjust beforehand" .)