Script due a daft comic device (7,3)
I believe the answer is:
custard pie
'comic device' is the definition.
The definition suggests a singular noun which matches the answer.
'script due a daft' is the wordplay.
'daft' indicates anagramming the letters.
'script'+'due'+'a'='scriptduea'
'scriptduea' is an anagram of 'CUSTARD-PIE'.
Can you help me to learn more?
(Other definitions for custard pie that I've seen before include "Clown's dessert?" , "What featured in comedy" , "It's thrown for laughs" , "But is one thrown" , "Item thrown in slapstick comedy" .)