Speed up outmoded exercise; edit changes (8)

I believe the answer is:

expedite

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'speed up' is the definition.
(I've seen this before)

'outmoded exercise edit changes' is the wordplay.
'outmoded' becomes 'ex' (I can't explain this - if you can you should give a lot more credence to this answer).
'exercise' becomes 'pe' (Physical Education).
'changes' indicates an anagram.
'edit' is an anagram of 'dite'.
'ex'+'pe'+'dite'='EXPEDITE'

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(Other definitions for expedite that I've seen before include "Push through faster" , "Hasten, facilitate" , "Hurry" , "Hasten progress" , "Speed up progress (of)" .)

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

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