Crossword Genius

Travel group expel antisocial extremists (2,2)

Ross

I believe the answer is:

el al

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'travel group' is the definition.
The definition suggests an adjective which matches the answer.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for el al that I've seen is " Israeli airline".)

I've seen this clue in The Irish Times.
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