London Tube station's financial investors (6)

I believe the answer is:

angels

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This clue could be a double definition.

'london tube station's financial' is the first definition.
I know that 'financial' relates to this answer.

'investors' is the second definition.
(I have seen 'Theatrical investors ' mean 'angels' so perhaps 'investors' could also mean 'angels')

Can you help me to learn more?

(Other definitions for angels that I've seen before include "Supernatural messengers" , "Gleans that they're heavenly" , "Cherubim, seraphim etc" , "Financial backers, esp theatrical" , "THIRD PART OF 12" .)

I've seen this clue in The Telegraph.

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