Crossword Genius

Having become established, one can get sent out (3,2)

Ross

I believe the answer is:

set in

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

'out' is the definition.
Although both the answer and definition are verbs in their base form, I don't see how one could define the other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for set in that I've seen is " Become established".)

I've seen this clue in the Evening Standard.
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