Crossword Genius

Problem involving upper-class person acting insincerely (6)

Ross

I believe the answer is:

poseur

'person acting insincerely' is the definition.

'problem involving upper-class' is the wordplay.
'problem' becomes 'poser' (poser is a kind of problem).
'involving' means one lot of letters goes inside another.
'upper-class' becomes 'u' ('u' can be similar in meaning to 'upper-class').
'poser' enclosing 'u' is 'POSEUR'.

(Other definitions for poseur that I've seen before include "Pseud, posturer" , "One seeking to impress others with affected style" , "Pretentious chap" , "One who strikes an attitude to impress" , "Affected person, strikes attitudes" .)

I've seen this clue in The Telegraph.
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