Encounter naked figure not at all quietly somersaulting (6,2)

'encounter' is the definition.
(to happen on something is to encounter it)

'naked figure not at all quietly somersaulting' is the wordplay.
I cannot quite see how this works, but
'not' could be 'non' (I've seen this in other clues) and 'non' is found in the answer.
'quietly' could be 'pp' (musical abbreviation for pianissimo) and 'pp' is found in the answer.
The remaining letters 'hae' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).