Daft king in doorway? Not on a regular basis (8)
I believe the answer is:
ignorant
'daft' is the definition.
'king in doorway? not on a regular basis' is the wordplay.
'on a regular basis' means one should take alternating letters.
'king'+'in'+'doorway'+'not'='kingindoorwaynot'
The alternating letters of 'kingindoorwaynot' are 'IGNORANT'.
(Other definitions for ignorant that I've seen before include "Illiterate - unaware" , "Unenlightened" , "Uncouth or uninformed" , "not read" , "Ill-mannered" .)