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Vigilance (9)

Ross

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9

12

alertness

'vigilance' is the definition.
(synonyms)

This is all the clue.

(Other definitions for alertness that I've seen before include "Watchful attitude" , "It's needed to respond quickly to danger" , "Showing attentive nature" , "Watchful state" , "Wakeful characteristic" .)

I've seen this clue in The Telegraph and The Mirror.
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