As the crow flies (6)
'as the crow flies' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for direct that I've seen before include "Command to be straight" , "Order; straight" , "By the shortest route" , "Aim; straight" , "Control the affairs" .)
'as the crow flies' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for straight that I've seen before include "Not curved or bent" , "Without curve or bend" , "Linear" , "Honest - direct" , "in a row" .)