Clue: J. Laurie's ardent one giving him orders at Walmington? (5)
Answer: ALOWE
Explanation: Definition: J. Laurie's ardent
J[ohn] Laurie played Private Frazer in *Dad's Army*, in which he would be given orders by Captain Mainwaring, played by A[rthur] LOWE. Alowe means "ablaze"; like Laurie/Frazer, from Scotland