Crossword Genius

Love to rate marshals, wisely beginning to spot-check 2020 calculation? (9-5,6)

Ross

I believe the answer is:

duckworth-lewis system

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'2020 calculation?' is the definition.
I know nothing about this answer so I can't judge whether this works.

'love to rate marshals wisely beginning to spot-check' is the wordplay.
I cannot really see how this works, but
'love' could be 'duck' (love and duck mean zero in tennis and cricket) and 'duck' is present in the answer.
'check' could be 'stem' (both can mean to control or stop) and 'stem' is present in 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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