Break a bone: sounds a major disaster here! (8)
I believe the answer is:
krakatoa
'sounds a major disaster here' is the definition.
The definition suggests a singular noun which matches the answer.
'break a bone' is the wordplay.
I cannot really understand how this works, but
'a' is present in the answer.
'bone' could be 't' (as in a T-bone steak) and 't' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for krakatoa that I've seen before include "Indonesian volcanic island with a massive eruption in 1883" , "Indonesia island, volcano" , "Indonesian caldera" , "Site of 1883 volcanic explosion" , "Volcanic Indonesian island that erupted violently in 1883" .)