Crossword Genius

Grammar topic (5)

Ross

I believe the answer is:

usage

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

This is the entire clue.

(Other definitions for usage that I've seen before include "Way of employing" , "Treatment, practice" , "Customary practice" , "Application" , "Particular meaning of a word" .)

I've seen this clue in the King Feature Syndicate and The Wall Street Journal.
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