Put income down or work it out electronically (7)

I believe the answer is:

compute

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'put' is the definition.
The answer and definition can be both related to thinking as well as being verbs in their base form.
Perhaps you can see a link between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for compute that I've seen before include "Work out" , "Reckon, calculate" , "Calculate, maybe electronically" .)

I've seen this clue in The Globe and Mail.

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