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This is my last one.....
7D: Flashing light - still light (6)
?T?O?E
It has to be 'strobe' . This is obviously a flashing light, but the other half of the clue? still light?
I'm sure it's going to be obvious........?
Explanation appreciated please!

I think this is correct :)
When you use a strobe light at the same frequency of a rotating image passing through the light the image appears motionless.

Thank you, claxby - I doubt many people know that!

http://www.fifteensquared.net/2014/12/01/guardian-26431-rufus/#more-81016

This explanation is given by Eileen on her blog, although she is a little uncertain.

and thanks, too, rossim