Where Arthur turned up a good deal (7)

I believe the answer is:

camelot

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'where arthur' is the definition.
The definition suggests a singular noun which matches the answer.

'turned up a good deal' is the wordplay.
'turned up' becomes 'came' (I've seen this in another clue).
'a good deal' becomes 'lot' (a good deal of something).
'came'+'lot'='CAMELOT'

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(Other definitions for camelot that I've seen before include "Where truth, goodness and beauty reigned, according to Arthurian legend" , "Legendary Arthurian kingdom" , "King Arthur's town" , "legendary town" , "Lerner and Loewe musical" .)

I've seen this clue in the Evening Standard.

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