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Disappointment ain't turned about by acquiring capital (10)

Ross

I believe the answer is:

anticlimax

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'disappointment' is the definition.
(I've seen this before)

'ain't turned about by acquiring capital' is the wordplay.
'turned' indicates anagramming the letters.
'about by acquiring capital' becomes 'climax' (I can't justify this - if you can you should give a lot more credence to this answer).
'aint' is an anagram of 'anti'.
'anti'+'climax'='ANTICLIMAX'

Can you help me to learn more?

(Other definitions for anticlimax that I've seen before include "Let-down after excitement" , "Damp squib" , "Disappointing ending" , "disappointment" , "disappointing outcome" .)

I've seen this clue in The Times.
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