Crossword Genius

Signal breaker, for example (4)

Ross

I believe the answer is:

wave

I believe this clue is a double definition.

'signal' is the first definition.
(thesaurus)

'breaker for example' is the second definition.
(breaker is a kind of wave)

(Other definitions for wave that I've seen before include "Billow" , "Hand signal; surge" , "Hand gesture - ridge of moving water" , "Drive forward" , "It may be permanent or Mexican" .)

I've seen this clue in The Telegraph.
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