Crossword Genius

Nothing stumped affluent person who ignores problems? (7)

Ross

I believe the answer is:

ostrich

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'person who ignores problems?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'nothing stumped affluent' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'stumped' becomes 'st' (cricket abbreviation).
'affluent' becomes 'rich' (similar in meaning).
'o'+'st'+'rich'='OSTRICH'

Can you help me to learn more?

(Other definitions for ostrich that I've seen before include "Someone unprepared to face the facts" , "Fast-running African flightless bird" , "Emu-like bird" , "Large flightless bird of Africa" , "with a big nest egg" .)

I've seen this clue in The Times.
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