How Stein became established? (3,2)

I believe the answer is:

set in

'became established?' is the definition.
(I've seen this in another clue)

'how stein' is the wordplay.
'how' indicates anagramming the letters (I've seen this in other clues).
'stein' anagrammed gives 'SET-IN'.

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

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app