Crossword Genius

Indication to stop studied when speaking (3)

Ross

I believe the answer is:

red

'indication to stop' is the definition.
(red traffic light)

'studied when speaking' is the wordplay.
'studied' becomes 'read' (I've seen this before).
'when speaking' indicates a 'sounds like' (homophone) clue.
'read' is a homophone of 'RED'.

(Other definitions for red that I've seen before include "Colour for danger" , "Warning light colour" , "Carmine" , "Very angry, seeing this" , "River, its source in the US, flowing north to empty into L Winnipeg" .)

I've seen this clue in The Times.
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