Crossword Genius

Drinker's remark hasn't succeeded in a perfect way (2,1,1)

Ross

I believe the answer is:

to a t

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'in a perfect way' is the definition.
Both the definition and answer are adverbs. Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for to a t that I've seen before include "In every detail" , "perfectly well" , "Exactly right" .)

I've seen this clue in The Times.
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