The Crossword Centre Clue-Writing Competition

CCCWC May competition voters’ comments
 
Clue no. 59: What typifies the volatility that has gone up during the time of May (7)

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A clue to MERCURY.
1 comment refers to this clue (from 1 competitor, 0 others)

Here is the text

Comments on the clue
1.Doesn’t work in the Southern hemisphere