Mineworkers' lift, a hundred years old? (4)
I believe the answer is:
cage
'mineworkers' lift' is the definition.
(type of lift used in a mine)
'a hundred years old?' is the wordplay.
'a hundred' becomes 'c' (Roman numeral).
'years old?' becomes 'age' (I can't justify this - if you can you should believe this answer much more).
'c'+'age'='CAGE'
Can you help me to learn more?
(Other definitions for cage that I've seen before include "Confine behind bars" , "US composer -- barred enclosure" , "Hutch" , "Enclose with bars" , "Eg, aviary" .)