Crossword Genius

Marks smeared in glass (7)

Ross

I believe the answer is:

signals

'marks' is the definition.

'smeared in glass' is the wordplay.
'smeared' indicates an anagram.
'in'+'glass'='inglass'
'inglass' is an anagram of 'SIGNALS'.

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

I've seen this clue in The Telegraph.
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