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Top-of-the-table game crowd left enthralled by Wales star (9)

Ross

I believe the answer is:

bagatelle

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

'wales star' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'top-of-the-table game crowd left enthralled by' is the wordplay.
I cannot quite understand how this works, but
'left' could be 'l' (common abbreviation) and 'l' is found within the answer.
'by' could be 'at' and 'at' is found in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for bagatelle that I've seen before include "Something trivial" , "Pinball game - something of little value" , "light piece" , "Trinket - game played on a board with balls" , "musical composition" .)

I've seen this clue in The Telegraph.
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