What does the cryptic crossword clue "Comprehensive but difficult progress (13)" mean?

The definition is "Comprehensive". The wordplay uses a charade (building blocks). THO (synonym of "but") + ROUGH (synonym of "difficult") + GOING (synonym of "progress"); definition: "Comprehensive" The answer is THOROUGHGOING.

Comprehensive but difficult progress (13)

Times Cryptic #28627 | 16 Across | 2023-06-12 flower

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