Warning from dealer trading (5)

I believe the answer is:

alert

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

'from dealer trading' is the wordplay.
'from' says the answer is hidden in the clue.
'ALERT' is hidden in the letters of 'dealer trading'.

(Other definitions for alert that I've seen before include "In state of watchfulness" , "Lively" , "Danger warning" , "Watchful, quick-thinking" , "Vigilantly attentive" .)

I've seen this clue in The Sun.

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