Seasonal treat, say, entertaining Daisy for example (6,3)
I believe the answer is:
easter egg
'seasonal treat' is the definition.
(I've seen this before)
'say entertaining daisy for example' is the wordplay.
'say' becomes 'eg' (both can mean 'for example').
'entertaining' indicates putting letters inside (inviting in, as for dinner).
'daisy' becomes 'aster' (I've seen this before).
'for example' becomes 'e.g.' (short for 'exempli gratia', 'for example' in Latin).
'aster'+'eg'='astereg'
'eg' going around 'astereg' is 'EASTER-EGG'.
(Other definitions for easter egg that I've seen before include "Seasonal fare" , "DVD bonus" , "festive gift" , "Seasonal confection" , "Segregate into popular post-Lenten sweet" .)