A light ending missing in metropolis disaster (8)
I believe the answer is:
calamity
'disaster' is the definition.
(I know that disaster can be written as calamity)
'a light ending missing in metropolis' is the wordplay.
'light' becomes 'lamp' (lamp is a kind of light).
'ending missing' means to remove the last letter.
'in' means one lot of letters goes inside another.
'metropolis' becomes 'city' (a metropolis is a large city).
'a'+'lamp'='alamp'
'alamp' with its last letter taken away is 'alam'.
'alam' inserted within 'city' is 'CALAMITY'.
(Other definitions for calamity that I've seen before include "Tragedy" , "Musical set in Deadwood" , "Catastrophe" , "15 [JANE] the frontierswoman" , "A disaster, like Western heroine Jane" .)