Crossword Genius

They are tedious drills (5)

Ross

I believe the answer is:

bores

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'drills' is the definition.
('bore' can be a synonym of 'drill')

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for bores that I've seen before include "Makes a hole with a pointed tool" , "Tedious people or drills" , "Dull tedious talkers" , "Drills or wearies" .)

I've seen this clue in The Times.
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