Before delta strain Covid ends, snoring interrupts vaccination of players (4,4)

I believe the answer is:

jazz band

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'vaccination of players' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'before delta strain covid ends snoring interrupts' is the wordplay.
'before' becomes 'jab' (I can't justify this - if you can you should believe this answer much more).
'ends' indicates one should take the final letters.
'snoring' becomes 'zz'.
'interrupts' is an insertion indicator.
The final letters of 'delta strain covid' are 'and'.
'jab'+'and'='jaband'
'jaband' placed around 'zz' is 'JAZZ BAND'.

Can you help me to learn more?

I've seen this clue in The Guardian.

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