Call our cat daft? At least it can multiply! (10)

I believe the answer is:

calculator

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

'least it can multiply' is the definition.
I can't judge whether this definition defines the answer.

'call our cat daft?' is the wordplay.
'daft?' indicates anagramming the letters (I've seen 'daft' mean this).
'call'+'our'+'cat'='callourcat'
'callourcat' with letters rearranged gives 'CALCULATOR'.

'at' is the link.

Can you help me to learn more?

(Other definitions for calculator that I've seen before include "this should provide some answers" , "See 12" , "Sum-doer's aid" , "Adding machine" , "Ready reckoner" .)

I've seen this clue in The Guardian.

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