1: Flower, large one, set up outside (5)
4: Praiseworthy naval officer, English, found around boat's prow (9)
8: Sleep around in sheds (5)
9: Train sets notwithstanding (9)
11: Detains stranger as a substitute (7)
13: Impostor made flanking attack (5)
14: Ejection of Jack from medieval competition (7)
15: The French inheritance given up by a former French colony (7)
17: Little bitty lines on a letter from Athens (7)
18: Stranger is using and supplying (7)
19: Disturbance is the robbery (5)
21: I stand in at queen's inauguration... wow! (7)
22: Established to trick company editor (9)
23: Birds in the wilderness (5)
25: Took a load off awfully thin ledge (9)
26: Out of context rather more than is necessary (5)