Crossword Genius

Bloomer from principal in West Bank city? (4-2-9)

Ross

I believe the answer is:

star-of-bethlehem

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

'bloomer' is the definition.
(I've seen this before)

'from principal in west bank city?' is the wordplay.
I cannot really understand how this works, but
'from' could be 'of' (I've seen this in other clues) and 'of' is present in the answer.
'principal' could be 'star' (synonyms) and 'star' is present in the answer.
The remaining letters 'bethlehem' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent and The Times.
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