Outgoing predictors of election? (4,5)

I believe the answer is:

exit polls

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'outgoing predictors of election?' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'outgoing predictors of election?' is the wordplay.
'outgoing' means one lot of letters goes inside another.
'predictors of' becomes 'exits' (I can't justify this - if you can you should believe this answer much more).
'election?' becomes 'poll' (I've seen this before).
'exits' going around 'poll' is 'EXIT POLLS'.

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I've seen this clue in the Sydney Morning Herald.

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