Obvious scheme to apprehend Iraqi leader (5)
I believe the answer is:
plain
'obvious' is the definition.
('plain' can be similar in meaning to 'obvious')
'scheme to apprehend iraqi leader' is the wordplay.
'scheme' becomes 'plan' (I've seen this before).
'to apprehend' means one lot of letters goes inside another.
'leader' says to take the initial letters.
The first letter of 'iraqi' is 'i'.
'plan' going around 'i' is 'PLAIN'.
(Other definitions for plain that I've seen before include "Simple, ordinary" , "open country" , "Unadorned, not elaborate" , "Undecorated; clear" , "Uncomplicated" .)