Crossword Genius

Training exercise (5)

Ross

I believe the answer is:

drill

'training exercise' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for drill that I've seen before include "strong twilled cotton" , "Tool for boring holes" , "Instruct" , "Military training; bore" , "Twilled cotton; soldiers' exercise" .)

I've seen this clue in The Guardian.
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