Fill up and put it on your account (6)

I believe the answer is:

charge

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'fill up' is the definition.
(I know that charge is a more specific form of the action fill up)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for charge that I've seen before include "Accumulation of electricity" , "Sortie" , "protection" , "Accuse of a crime" , "Do as the Light Brigade did" .)

I've seen this clue in the Evening Standard.

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