See upset pug bite father, appearing suddenly from below (7,2)

I believe the answer is:

popping up

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'father appearing suddenly from below' is the definition.
I can't judge whether this definition defines the answer.

'see upset pug bite' is the wordplay.
'see' becomes 'pop' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'upset' shows that the letters should be reversed in order.
'bite' becomes 'nip' (nip is a kind of bite).
'pug'+'nip'='pugnip'
'pugnip' reversed gives 'pingup'.
'pop'+'pingup'='POPPING UP'

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I've seen this clue in The Irish Times.

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