Cheese sandwiches are cut for author (6)
I believe the answer is:
barrie
'for author' is the definition.
(I've seen this before)
'cheese sandwiches are cut' is the wordplay.
'cheese' becomes 'brie' (Brie is an example).
'sandwiches' is an insertion indicator (to sandwich is to block something in).
'cut' means to remove the last letter.
'are' with its last letter taken off is 'ar'.
'brie' placed around 'ar' is 'BARRIE'.
(Other definitions for barrie that I've seen before include "J. M. -, Peter Pan creator" , "J. M. -, Peter Pan author" , "Peter Pan's creator" , "J M ...... created Peter Pan" , "Children's writer" .)