One hundred, worn-out and stiff (4)
I believe the answer is:
cold
'stiff' is the definition.
(thesaurus)
'one hundred worn-out' is the wordplay.
'one hundred' becomes 'c' (Roman numeral).
'worn-out' becomes 'old' (I've seen this in another clue).
'c'+'old'='COLD'
'and' acts as a link.
(Other definitions for cold that I've seen before include "Nippy" , "Frigid" , "Chill" , "Lacking affection" , "Biting" .)