Crossword Genius

Exceptional bus plan's sure a hit (13)

Ross

I believe the answer is:

unsurpassable

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'exceptional' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?

'bus plan's sure a hit' is the wordplay.
'hit' indicates an anagram.
'bus'+'plans'+'sure'+'a'='busplanssurea'
'busplanssurea' is an anagram of 'UNSURPASSABLE'.

Can you help me to learn more?

(Another definition for unsurpassable that I've seen is " Not able to be bettered".)

I've seen this clue in The Telegraph.
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