Posh jeweller's opening in Brighton, with a great deal (7)

I believe the answer is:

boodles

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'posh jeweller's opening in brighton with a great deal' is the definition.
I can't judge whether this definition defines the answer.

'opening in brighton with a great deal' is the wordplay.
'opening in' says to take the initial letters.
'with' means one lot of letters go next to another.
'a great deal' becomes 'oodles' (I've seen this in another clue).
The initial letter of 'brighton' is 'b'.
'b'+'oodles'='BOODLES'

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I've seen this clue in The Independent.

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