This account is not always strictly truthful (7)

I believe the answer is:

expense

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'this account' is the definition.
(expense account is a kind of account)

I can't explain the rest of the clue.

(Other definitions for expense that I've seen before include "Cost - price" , "damage" , "Money spent in the course of work" , "Disbursal" , "Disbursement" .)

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

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