Deuce shuffled in decks (7)
I believe the answer is:
dickens
'deuce' is the definition.
('dickens' can be a synonym of 'deuce')
'shuffled in decks' is the wordplay.
'shuffled' indicates an anagram.
'in'+'decks'='indecks'
'indecks' is an anagram of 'DICKENS'.
(Other definitions for dickens that I've seen before include "Charles . . . . . . . whose pen name was Boz" , "Devil of a novelist!" , "The Lord of the Flies" , "See 1" , "'Hard Times' 17" .)