Where a journey may start or a trip be arranged (7)

I believe the answer is:

airport

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'where a journey may start' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'or a trip be arranged' is the wordplay.
'be arranged' indicates anagramming the letters.
'or'+'a'+'trip'='oratrip'
'oratrip' anagrammed gives 'AIRPORT'.

Can you help me to learn more?

(Other definitions for airport that I've seen before include "plane where it lands" , "Liverpool's John Lennon, for example" , "Fliers' terminus" , "Terminal for planes" , "Par trio (anag) -- Charles de Gaulle, say" .)

I've seen this clue in The Globe and Mail.

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