Crossword Genius

He makes arrangements for trippers! (13)

Ross

I believe the answer is:

excursionists

I'm a little stuck... Click here to teach me more about this clue!

'for trippers' is the definition.
('excursionist' can be a synonym of 'tripper')

'he makes arrangements' is the wordplay.
I cannot quite see how this works, but
'he' could be 'si' and 'si' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Irish Independent.
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