Crossword Genius

Simple computational device - one with slide? (5)

Ross

I believe the answer is:

adder

I believe this clue is a double definition.

'simple computational device' is the first definition.
(device for adding numbers)

'one with slide?' is the second definition.
(as in a slide adder - device for basic addition)

(Other definitions for adder that I've seen before include "Dread (anag)" , "Viper common in northern Eurasia" , "Britain's only venomous snake" , "One creature" , "danger in the countryside" .)

I've seen this clue in The Independent.
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