Crossword Genius

Believe, after a century, one can get tired! (6)

Ross

I believe the answer is:

credit

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

'believe' is the definition.
(I know that believe is a kind of credit)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for credit that I've seen before include "Direct (anag) - tick" , "Belief - trust - favourable acknowledgment" , "entry in cashbook" , "(Account) sum received" , "'Give ...... where ...... is due'" .)

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