Crossword Genius

The blinking thing can shut the light out! (6)

Ross

I believe the answer is:

eyelid

I'm a little stuck... Click here to teach me more about this clue!

'the blinking thing can' is the definition.
The definition and answer can be both body parts as well as being singular nouns.
Maybe there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for eyelid that I've seen before include "Protection for organ of sight" , "Drop it and you cannot see" , "Skin over viewer" , "Object of batting" , "Optical membrane" .)

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app