Being posh can make a person poorer (4)

I believe the answer is:

fine

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'being posh' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

(Other definitions for fine that I've seen before include "Very thin; punishment" , "Usual penalty for parking offence" , "Not coarse" , "Money paid as penalty" , "Monetary penalty inflicted by law" .)

I've seen this clue in the Evening Standard.

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