A position since about ten (5)

I believe the answer is:

sixth

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'a position' is the definition.
(sixth is a kind of position)

'since about ten' is the wordplay.
'since' becomes 'sith' (I can't explain this - if you can you should believe this answer much more).
'about' indicates putting letters inside.
'ten' becomes 'x' (roman numeral).
'sith' placed around 'x' is 'SIXTH'.

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(Other definitions for sixth that I've seen before include "Beaten by five" , "ordinal" , "Musical interval from A to F, say" , "fraction" .)

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

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