Crossword Genius

First-class umpire confused start of match (7)

Ross

I believe the answer is:

premium

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

'umpire confused start of match' is the wordplay.
'confused' indicates an anagram.
'start of' indicates taking the first letters.
The initial letter of 'match' is 'm'.
'umpire' with letters rearranged gives 'premiu'.
'premiu'+'m'='PREMIUM'

Can you help me to learn more?

(Other definitions for premium that I've seen before include "Superior; amount paid for insurance" , "Amount payable for insurance etc" , "Great value - bonus" , "highest quality" , "Insurance charge" .)

I've seen this clue in The Guardian.
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