Show a broken door has a key in it (5)
I believe the answer is:
rodeo
'show' is the definition.
(rodeo is a kind of show)
'a broken door has a key in it' is the wordplay.
'a broken' indicates anagramming the letters.
'has a key' becomes 'e' (I can't justify this - if you can you should give a lot more credence to this answer).
'in it' is an insertion indicator.
'door' with letters rearranged gives 'rodo'.
'rodo' going around 'e' is 'RODEO'.
Can you help me to learn more?
(Other definitions for rodeo that I've seen before include "competition in cowboy skills" , "Cowboy competition, riding horses and bulls" , "Cowboy show" , "off, sometimes" , "Cattle round-up" .)