Crossword Genius

Short note written about part of speech (4)

Ross

I believe the answer is:

verb

'part of speech' is the definition.
(verb is a kind of part of speech in grammar)

I cannot understand how the rest of the clue works.

(Other definitions for verb that I've seen before include "Type of word indicating action" , "A word that conveys action" , "Part of speech" , "'In grammar, it denotes action (4)'" , "Predicate of a sentance (4)" .)

I've seen this clue in The Times.
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