Confirm complete reprimand (4,3)

I believe the answer is:

tick off

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This clue might be a double definition.

'confirm' is the first definition.
(I know that tick off is a kind of the verify)

'complete reprimand' is the second definition.
'tick off' can be an answer for 'reprimand' (I've seen this before). I am not sure about the 'complete' bit.

Can you help me to learn more?

(Other definitions for tick off that I've seen before include "Check through a list - reprimand" , "Put mark on" , "Scold" , "Indicate checking" , "Reprimand (sl.)" .)

I've seen this clue in The Independent.

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