Clear about answer being straight (4)
I believe the answer is:
neat
'straight' is the definition.
('neat' can be a synonym of 'straight')
'clear about answer' is the wordplay.
'clear' becomes 'net' (as in net profit).
'about' indicates putting letters inside.
'answer' becomes 'a' (abbreviation eg in Q and A).
'net' enclosing 'a' is 'NEAT'.
'being' acts as a link.
(Other definitions for neat that I've seen before include "avoiding water?" , "Nicely proportioned" , "Taken without water" , "(Of alcohol) not diluted" , "Drink with no water added" .)