Harlotry able to flourish exclusively in London venue (5,6,4)

I believe the answer is:

royal albert hall

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'london venue' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'harlotry able to flourish exclusively' is the wordplay.
'to flourish' indicates anagramming the letters (I've seen 'flourishing' mean this (letters grow or flourish differently)).
'exclusively' becomes 'all' (I've seen this in another clue).
'harlotry'+'able'='harlotryable'
'harlotryable' with letters rearranged gives 'royalalberth'.
'royalalberth'+'all'='ROYAL ALBERT HALL'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for royal albert hall that I've seen before include "Home of the 'Proms'" , "concert venue" .)

I've seen this clue in The Times.

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