A much niftier, refurbished gaming device (5,7)
I believe the answer is:
fruit machine
'gaming device' is the definition.
(I've seen this before)
'a much niftier refurbished' is the wordplay.
'refurbished' indicates an anagram.
'a'+'much'+'niftier'='amuchniftier'
'amuchniftier' anagrammed gives 'FRUIT-MACHINE'.
(Other definitions for fruit machine that I've seen before include "Gaming device" , "Gambling device taking coins" , "Feature of amusement arcade" , "One-armed bandit" .)