Crossword Genius

Drastic, thorough (7)

Ross

I believe the answer is:

radical

I believe this is a double definition.

'drastic' is the first definition.
(I've seen this before)

'thorough' is the second definition.
(as in a radical or thorough overhaul of something)

(Other definitions for radical that I've seen before include "Progressive; extreme" , "Basic" , "Going to the roots, fundamental as change may be" , "Dial car in order to be drastic" , "One seeking root and branch reform" .)

I've seen this clue in The Sun.
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