Crossword Genius

Signal from whaler transmitted (5)

Ross

I believe the answer is:

alert

'signal' is the definition.
(I know that alert is a type of signal)

'from whaler transmitted' is the wordplay.
'from' indicates a hidden word.
'ALERT' is hidden in the letters of 'whaler transmitted'.

(Other definitions for alert that I've seen before include "Wakeful, observant" , "Signal danger" , "In state of watchfulness" , "Awake, attentive" , "On the ball" .)

I've seen this clue in The Independent and The Sun.
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