sixty-six point six recurring

[aintgotaclue]

I'm confused over this one or I am thick.
What is a word for sixty six point x recurring

[Captain2]

Two thirds

[tenrec]

sixty-six point six recurring

[Hopkirk]

Sixtyseven

[Baldric]

TWO THIRDS

[Lie-in King]

MOS Prize 1553

25d Two-thirds

Hi aintgotaclue - it's always nice to include the number of letters & any you've placed, so that people without the puzzle can more readily help you :-)

[aintgotaclue]

So sorry Lie-in King. Don't normal do this. Must be having a very senior moment but anyway thank you all very much.

[mickja]

two thirds

[factor-fiction]

The clue is not great as it would make more sense if it included the words 'per cent'