Saturday edition fully filled (5)
I believe the answer is:
sated
'fully filled' is the definition.
(I've seen this before)
'saturday edition' is the wordplay.
'saturday' becomes 'sat' (short for Saturday).
'edition' becomes 'ed' (abbreviation).
'sat'+'ed'='SATED'
(Other definitions for sated that I've seen before include "Fully satisfied" , "Glutted" , "Indulged to the full" , "fully indulged" , "fully filled" .)