Author possibly out to feed duck? (5)
I believe the answer is:
defoe
'author' is the definition.
(Daniel Defoe)
'out to feed duck?' is the wordplay.
'out to' indicates an anagram.
'duck?' becomes 'o'.
'feed'+'o'='feedo'
'feedo' anagrammed gives 'DEFOE'.
'possibly' acts as a link.
(Other definitions for defoe that I've seen before include "Daniel ---, wrote Moll Flanders" , "Daniel, writer, d. 1731" , "Daniel --, English novelist" , "Daniel, author of Robinson Crusoe" , "See 14" .)