Spring-loaded lock on door of flat, changed discreetly (5)
I believe the answer is:
latch
'spring-loaded lock on door' is the definition.
I can't judge whether this definition defines the answer.
'of flat changed discreetly' is the wordplay.
'of' indicates a hidden word.
'LATCH' is hidden in the letters of 'flat changed discreetly'.
Can you help me to learn more?
(Other definitions for latch that I've seen before include "retainer" , "Gate bar" , "Door-catch" , "Light door lock" , "Door catch" .)