.... as Gradey revises distances (8)

I believe the answer is:

yardages

'distances' is the definition.
(I know this)

'as gradey revises' is the wordplay.
'revises' indicates anagramming the letters.
'as'+'gradey'='asgradey'
'asgradey' with letters rearranged gives 'YARDAGES'.

(Another definition for yardages that I've seen is " Charges".)

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

Want a hint initially instead of a full solution? Install my app