Poser from takeaway has no idea (8)
I believe the answer is:
clueless
'poser from takeaway' is the definition.
The definition suggests an adjective which matches the answer.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for clueless that I've seen before include "such a crossword can't be solved!" , "Lacking in ideas" , "how I started this puzzle!" , "Knowing nothing" , "With no idea" .)