Grave danger (5)

I believe the answer is:

peril

'grave danger' is the definition.
(peril means great danger)

This is the entire clue.

(Other definitions for peril that I've seen before include "Danger, jeopardy" , "Danger, hazard" , "Quest" , "risk" , "Hazardous situation" .)

I've seen this clue in The Daily Mail, the LA Times, the Family Time, the Universal and The Mirror.

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