Being mean, I would switch position to 800m, say (6-8)

I believe the answer is:

middle-distance

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'switch position to 800m say' is the definition.
I can't judge whether this defines the answer.

'being mean i would' is the wordplay.
'being mean' becomes 'middle' (I've seen this in another clue).
'i would' becomes 'distance' (I can't justify this - if you can you should believe this answer much more).
'middle'+'distance'='MIDDLE-DISTANCE'

Can you help me to learn more?

I've seen this clue in The Daily Express.

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