100 too old for insurance? (8)
I believe the answer is:
coverage
'for insurance?' is the definition.
('coverage' can be a synonym of 'insurance')
'100 too old' is the wordplay.
'100' becomes 'C' (Roman numeral).
'too old' becomes 'overage' (I've seen this before).
'c'+'overage'='COVERAGE'
(Other definitions for coverage that I've seen before include "News reports" , "publicity" , "Treatment of news" , "level of press attention" , "news attention" .)