Crossword Genius

Show-off in post office regrets turning up (6)

Ross

I believe the answer is:

poseur

'show-off' is the definition.
(I know that poseur is a type of show-off)

'post office regrets turning up' is the wordplay.
'post office' becomes 'po' (abbreviation).
'regrets' becomes 'rues' ('rue' can be a synonym of 'regret').
'turning up' shows that the letters should be reversed in order.
'rues' in reverse letter order is 'seur'.
'po'+'seur'='POSEUR'

'in' acts as a link.

(Other definitions for poseur that I've seen before include "One trying to impress others" , "Exhibitionist" , "One shows off to impress" , "One who strikes attitudes, a phoney" , "Pretentious type" .)

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