Crossword Genius

Summer featured days on the turn, shorter (5)

Ross

I believe the answer is:

adder

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'summer' is the definition.
(someone who adds or does sums)

'featured days on the turn shorter' is the wordplay.
'ADDER' is hidden back-to-front in amongst the letters.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for adder that I've seen before include "Venemous snake" , "Small poisonous snake, viper" , "He's making an extension" , "Something you have to reckon with" , "exhibit in the reptile house" .)

I've seen this clue in The Times.
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