More than one title-holder chafes at the bit (6)
I believe the answer is:
champs
This clue is a double definition.
'more than one title-holder' is the first definition.
('champ' can be a synonym of 'title-holder')
'chafes at the bit' is the second definition.
('champ' can be a synonym of 'chafe at the bit')
(Other definitions for champs that I've seen before include "Munches noisily like horse at bit" , "Munches noisily like abbreviated winners" , "frets impatiently" , "Title holders" , "Heaven in Paris?" .)