Crossword Genius

Public transport that is run with more passengers aboard? (6)

Ross

I believe the answer is:

busier

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'more passengers aboard?' is the definition.
I can't judge whether this definition defines the answer.

'public transport that is run' is the wordplay.
'public transport' becomes 'bus' (bus is a kind of public transport).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'run' becomes 'r' (cricket abbreviation).
'bus'+'ie'+'r'='BUSIER'

'with' acts as a link.

Can you help me to learn more?

(Other definitions for busier that I've seen before include "More fully engaged in work" , "More fully engaged or occupied" , "More active or engaged in work" , "Having a great deal more to do" , "More full of activity" .)

I've seen this clue in The Times.
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