Crossword Genius

Spring-loaded lock on door of flat, changed discreetly (5)

Ross

I believe the answer is:

latch

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Irish Times.
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