1: Old aircraft and odd blimp on a fixed course (7)
2: Found jumbo rig in a teamster's parts (9)
3: Narcs study crackhead's ultimate road to nowhere (4,3)
4: Ground dipped around bottom of ditch (7)
5: Again dices pith of herb as stuffing for baguettes (7)
6: Avoid duty like a self-satisfied leg-puller (7)
7: Mechanical worker pushing start button in the depths of the plant (5)
8: End of the line in 28 across - it's of prime importance (7)
15: There are crazy Romanians in this tiny republic. (3,6)
16: Points about dangerous wires can invigorate. (7)
17: Ingrained reaction at home for wildlife (7)
18: Appreciate it: a large data format (7)
19: Lady hugging extremely old lumberjack (7)
20: Tits are flying birds (7)
23: Warrigal 13-across poorly (5)