Innovative, using a pneumatic drill (14)
I believe the answer is:
groundbreaking
'innovative' is the definition.
(I know that innovative can be written as groundbreaking)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for groundbreaking that I've seen before include "Daring" , "Pioneering" .)
I've seen this clue in The Daily Express.
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