Became established anew in part of Westminster (3,2)
I believe the answer is:
set in
'became established' is the definition.
(I've seen this in another clue)
'anew in part of westminster' is the wordplay.
I cannot quite see how this works, but
'in' is present in the answer.
The remaining letters 'set' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for set in that I've seen is " Become established".)