It's bound to fall when a thing gets broken (5)
I believe the answer is:
night
'it's bound to fall' is the definition.
I can't tell whether this definition defines the answer.
'a thing gets broken' is the wordplay.
'gets broken' is an anagram indicator.
'thing' with letters rearranged gives 'NIGHT'.
'when' acts as a link.
Can you help me to learn more?
(Other definitions for night that I've seen before include "Period of darkness" , "See 1 Across" , "That's when it's darkest" , "What proverbially follows day" , "A Hard Day's (the Beatles)" .)