Crossword Genius

Grit held loosely - it brings traffic to a standstill (3,5)

Ross

I believe the answer is:

red light

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'it brings traffic to a standstill' is the definition.
The definition suggests a singular noun which matches the answer.

'grit held loosely' is the wordplay.
'loosely' indicates an anagram (a looser version of the letters).
'grit'+'held'='gritheld'
'gritheld' with letters rearranged gives 'RED-LIGHT'.

Can you help me to learn more?

(Other definitions for red light that I've seen before include "Don't go through it!" , "Illumination indicating danger" , "Colourful district housing brothels" , "sleazy" , "Stop signal" .)

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