Stirring at last: 'Shake your chains to earth' like champions! (6)
I believe the answer is:
heroes
'champions' is the definition.
('hero' can be a synonym of 'champion')
'stirring at last shake your chains to earth like' is the wordplay.
'stirring' indicates an anagram.
'at last' indicates one should take the final letters.
The final letters of 'shake your chains to earth like' are 'ersohe'.
'ersohe' with letters rearranged gives 'HEROES'.
(Other definitions for heroes that I've seen before include "Record sung by 14 [BOWIE]" , "Courageous persons" , "Cavaliers" , "Chief (male) characters of book, film, etc" , "Men of courage, chief characters in plays" .)