Encourage somebody’s effrontery? That’s just embarrassing (3,2,4,4)

I believe the answer is:

egg on ones face

'that's just embarrassing' is the definition.
(phrase meaning in an embarrassing situation)

'encourage somebody's effrontery?' is the wordplay.
'encourage' becomes 'egg on' (to egg somebody on is to encourage them).
'somebody's' becomes 'one's' (belonging to a person).
'effrontery?' becomes 'face' (synonyms).
'eggon'+'ones'+'face'='EGG ON ONES FACE'

I've seen this clue in The Times.

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