To applaud a role thats turned up will be just empty words (8)
I believe the answer is:
claptrap
'empty words' is the definition.
(I've seen this before)
'to applaud a role' is the wordplay.
'to applaud' becomes 'clap' (synonyms).
'a role' becomes 'trap' (I can't explain this - if you can you should believe this answer much more).
'clap'+'trap'='CLAPTRAP'
'thats turned up will be just' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for claptrap that I've seen before include "Applaud snare? - that's pretentious nonsense" , "Cobblers" , "Absurd or nonsensical talk or ideas" , "Bull" , "Bunk" .)