Believe only one side of the account (6)

I believe the answer is:

credit

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This might be a double definition.

'believe only' is the first definition.
'credit' can be an answer for 'believe' (I've seen this before). I am unsure of the 'only' bit.

'one side of the account' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for credit that I've seen before include "Acknowledgement given for deed or quality" , "Money available for a client to borrow" , "Favourable balance - belief" , "support for one with money problems" , "Belief; tick" .)

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

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