Crossword Genius

Plenty of success in the past, moving round (1,4,3)

Ross

I believe the answer is:

a good run

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

'plenty of success in' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'past moving round' is the wordplay.
I cannot really understand how this works, but
'past' could be 'ago' (similar in meaning) and 'ago' is found within the answer.
an anagram of 'round' is 'odrun' which is within the answer.
No letters remain.
This explanation may well be incorrect...

'the' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.
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