Crossword Genius

Completely posh trifle? (3)

Ross

I believe the answer is:

sou

'trifle?' is the definition.
(I've seen this in another clue)

'completely posh' is the wordplay.
'completely' becomes 'so' (both can mean 'very much').
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'so'+'u'='SOU'

(Other definitions for sou that I've seen before include "bit of money" , "Old French monetary unit" , "Something of little worth" , "Defunct French coin" , "Tiny amount of money" .)

I've seen this clue in the Sydney Morning Herald.
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