19 down
Lizard
in
open
country
impeded
by
idiot
(7)
Lizard in open country impeded by idiot (7)
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The definition is at the beginning of the clue.
How the clue works
The definition is Lizard — a monitor lizard, specifically. Open country gives you MOOR, and an idiot is a NIT, which gets inserted inside it ("impeded by"), splitting MOOR into MO and OR with NIT wedged in the middle to give you MO+NIT+OR.