Crossword Genius

Bundle of Covid tests for '60s entertainers? (3,4)

Ross

I believe the answer is:

rat pack

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

'covid tests for '60s entertainers?' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'bundle' is the wordplay.
I cannot quite see how this works, but
'bundle' could be 'pack' (pack can mean a bundle of items) and 'pack' is found within the answer.
The remaining letters 'rat' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'of' acts as a link.

Can you help me to learn more?

(Another definition for rat pack that I've seen is " Paparazzi as a group".)

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