Crossword Genius

What a gold-digger might do at posh ball for host (8)

Ross

I believe the answer is:

landlord

I'm a little stuck... Click here to teach me more about this clue!

'for host' is the definition.
(thesaurus)

'what a gold-digger might do at posh ball' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found in the answer.
'gold' could be 'or' ('or' is the heraldic name for gold) and 'or' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for landlord that I've seen before include "Property owner who leases to others" , "He lets out building for rent" , "He owns the building, collects the rent" , "Pub proprietor" , "Male lessor" .)

I've seen this clue in The Times and The Sunday Times.
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