Crossword Genius

Adder, and when to see it? (6)

Ross

I believe the answer is:

summer

'adder' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for summer that I've seen before include "` `Now is the winter of our discontent / Made glorious ... by this sum of York' ' (Richard III)" , "'Now is the winter of our discontent / Made glorious ... by this sun of York' (Richard III)" , "Period of heat" , "Late singer" , "Would one count" .)

I've seen this clue in The Times.
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