Live with Mennonites - brilliant! (7)

I believe the answer is:

beamish

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'brilliant' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I can't see?

'live with mennonites' is the wordplay.
'live' becomes 'be' (synonyms).
'with' is a charade indicator (letters next to each other).
'mennonites' becomes 'amish' (I've seen this in another clue).
'be'+'amish'='BEAMISH'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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