Crossword Genius

Coloured lights set in glass (7)

Ross

I believe the answer is:

signals

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'coloured lights' is the definition.
The definition and answer can be both related to communication as well as being plural nouns.
Maybe there's an association between them I don't understand?

'set in glass' is the wordplay.
'set' is an anagram indicator (instruction to set the letters).
'in'+'glass'='inglass'
'inglass' with letters rearranged gives 'SIGNALS'.

Can you help me to learn more?

(Other definitions for signals that I've seen before include "Coded communications" , "Indications or gestures as information or warning" , "Flags, gestures" , "(Traffic) lights" , "Actions that encode messages" .)

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