The Crossword Centre Clue-Writing Competition

CCCWC March competition voters’ comments
 
Clue no. 50: Sigma in a maths book?

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A clue to SUMMER.
3 comments refer to this clue (from 3 competitors, 0 others)

Here is the text

Comments on the clue
1.I'm struggling to see any misdirection – it doesn't seem very cryptic to me?
2.Not cryptic enough for a crossword clue
3.Sigma is a notation to sum; it is not one that sums.