Pretend to be in front? How could you! (3,5)

I believe the answer is:

for shame

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'could you' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'pretend to be in front?' is the wordplay.
'pretend' becomes 'sham' (sham can mean false or imitation).
'to be in' is an insertion indicator.
'front?' becomes 'fore' ('fore' is associated in meaning with 'front').
'sham' placed into 'fore' is 'FOR SHAME'.

'how' acts as a link.

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