Crossword Genius

A flicker of light? (6)

Ross

I believe the answer is:

switch

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This might be a double definition.

'a flicker' is the first definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'light?' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'of' is the link.

Can you help me to learn more?

(Other definitions for switch that I've seen before include "On/off device" , "Circuit breaker; change" , "Device for completing or breaking an electrical circuit" , "that turns on the power" , "turn" .)

I've seen this clue in The Globe and Mail.
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