Crossword Genius

Parts of plane, for example, complete (4,3,6)

Ross

I believe the answer is:

root and branch

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(Other definitions for root and branch that I've seen before include "(Extirpated) utterly" , "Utterly -- radically" , "completely" , "Thoroughly" , "(Of a process) thorough, radical" .)

I've seen this clue in The Telegraph.
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