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 an anagram.
'has a key' becomes 'e' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in it' indicates putting letters inside.
'door' anagrammed gives 'rodo'.
'rodo' placed 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" .)