Signal fear (5)

I believe the answer is:

alarm

I believe this clue is a double definition.

'signal' is the first definition.
(alarm is a kind of signal)

'fear' is the second definition.
(alarm is a kind of fear)

(Other definitions for alarm that I've seen before include "Warning bell" , "It signals danger" , "Feeling of fear" , "Sudden apprehension and fear" , "Unnerve" .)

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

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