Crossword Genius

Perfect guards later quit an iffy COVID measure (5,10)

Ross

I believe the answer is:

hotel quarantine

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

'perfect guards later quit an iffy covid' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'measure' is the wordplay.
I cannot quite understand how this works, but
'measure' could be 'in' (in is a kind of measure) and 'in' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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