Crossword Genius

Diminutive person always ready (3)

Ross

I believe the answer is:

pat

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'ready' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

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(Other definitions for pat that I've seen before include "Touch; name" , "well-rehearsed" , "Touch lightly - bit of butter?" , "Small butter piece" , "Knob (of butter)" .)

I've seen this clue in the Evening Standard.
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