Some dealer, thorough, shows warning (5)

I believe the answer is:

alert

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

'some dealer thorough shows' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'ALERT' can be found hidden inside 'dealer thorough shows'.

(Other definitions for alert that I've seen before include "Watchful, sharp" , "Quick to notice" , "'Attentive, vigilant (5)'" , "Watchful and bright" , "Vigilant, watchful" .)

I've seen this clue in The Times.

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