Dress that makes a heartless tyrant rage (6)
I believe the answer is:
attire
'dress' is the definition.
(I know that dress can be written as attire)
'a heartless tyrant rage' is the wordplay.
'heartless' suggests removing the centre.
'rage' becomes 'ire' (ire is intense rage).
'tyrant' with its middle taken out is 'tt'.
'a'+'tt'+'ire'='ATTIRE'
'that makes' is the link.
(Other definitions for attire that I've seen before include "Wear" , "'Dress, garb (6)'" , "12" , "Habit" , "I treat badly the dress." .)