Crossword Genius

One that organises trips in LA can get very busy (6,6)


I believe the answer is:

travel agency

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'one that organises trips' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'la can get very busy' is the wordplay.
'busy' is an anagram indicator.
'lacangetvery' anagrammed gives 'TRAVEL AGENCY'.

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Times.
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