Crossword Genius

Snake giving something more? (5)

Ross

I believe the answer is:

adder

I'm a little stuck... Click here to teach me more about this clue!

'snake' is the definition.
(I know that adder is a type of viper)

'giving something more?' is the wordplay.
'giving' becomes 'add' (I can't justify this - if you can you should give a lot more credence to this answer).
'something' becomes 'er' (I've seen this in other clues).
'more?' says to put letters next to each other (some letters added to the previous ones).
'add'+'er'='ADDER'

Can you help me to learn more?

(Other definitions for adder that I've seen before include "Something you have to reckon with" , "venomous creature" , "on country walks?" , "Britain's only venomous snake" , "Venemous snake" .)

I've seen this clue in The Irish Independent.
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