Crossword Genius

One might have three parts, with or without its last letter (5)

Ross

I believe the answer is:

suite

(Other definitions for suite that I've seen before include "Compensate for (faults)" , "Retinue; apartment" , "Musical composition" , "Train; set of rooms" , "Adjoining rooms" .)

I've seen this clue in The New York Times.
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