Man, tenor, breaking decorative object (8)
I believe the answer is:
ornament
'decorative object' is the definition.
(I've seen this before)
'man tenor breaking' is the wordplay.
'breaking' indicates an anagram.
'man'+'tenor'='mantenor'
'mantenor' anagrammed gives 'ORNAMENT'.
(Other definitions for ornament that I've seen before include "It's used to adorn" , "Decorative item" , "Knick-knack" , "Decorate" , "deck" .)