Witches start telling danger affected opera theatre (6,6)

I believe the answer is:

covent garden

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'opera theatre' is the definition.
The definition suggests a singular noun which matches the answer.

'witches start telling danger affected' is the wordplay.
'witches' becomes 'coven' (I've seen this before).
'start' suggests taking the first letters.
'affected' indicates an anagram.
The first letter of 'telling' is 't'.
'danger' is an anagram of 'garden'.
'coven'+'t'+'garden'='COVENT GARDEN'

Can you help me to learn more?

(Other definitions for covent garden that I've seen before include "Royal Opera House location" , "London tourist area with opera house" , "London's old fruit and veg market" , "Site of London's Royal Opera House" .)

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

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