What does the cryptic crossword clue "Zealots found blocking road, ie hard shoulder (8)" mean?

The definition is "Zealots". The wordplay uses a hidden word. Hidden in [ blocking ] "roa D IE HARD S houlder" The answer is DIEHARDS.

Zealots found blocking road, ie hard shoulder (8)

Guardian Cryptic #29149 | 8 Down | 2023-08-15 flower