Crossword Genius

Posh politician, with passion, able to count up to six (6)

Ross

I believe the answer is:

umpire

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'able to count up to six' is the definition.
I can't judge whether this definition defines the answer.

'posh politician with passion' is the wordplay.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'politician' becomes 'MP' (Member of Parliament).
'with' is a charade indicator (letters next to each other).
'passion' becomes 'ire' (ire is passionate anger).
'u'+'mp'+'ire'='UMPIRE'

Can you help me to learn more?

(Other definitions for umpire that I've seen before include "Sports official" , "Football official" , "Arbiter of cricket match" , "Adjudicator in games such as cricket, tennis etc" , "Impartial supervisor" .)

I've seen this clue in the Evening Standard.
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