In the end talking rubbish brings sparkle (7)
I believe the answer is:
glitter
'sparkle' is the definition.
(synonyms)
'in the end talking rubbish' is the wordplay.
'in the end' suggests the final letters.
'rubbish' becomes 'litter' (litter is a kind of rubbish).
The last letter of 'talking' is 'g'.
'g'+'litter'='GLITTER'
'brings' acts as a link.
(Other definitions for glitter that I've seen before include "Sparkly decoration" , "Flash" , "Sparkling decoration" , "Sparkle on cards" , "Gleam" .)