Crossword Genius

Smoking accessory is more trivial (7)

Ross

I believe the answer is:

lighter

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'smoking accessory' is the definition.
(I've seen this before)

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

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(Other definitions for lighter that I've seen before include "- boot; - bun; - ware" , "smoker may resort to it" , "Less weighty" , "Barge - alternative to match" , "Ship to shore boat" .)

I've seen this clue in The Daily Express.
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