Crossword Genius

Hiram —, US-born inventor of the first automatic machine gun (5)

Ross

I believe the answer is:

maxim

(Other definitions for maxim that I've seen before include "General rule" , "Saying - inventor of machine gun" , "Saying, adage" , "Apophthegm" , "Short pithy saying" .)

I've seen this clue in The Mirror.
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