In the War a daring means of communication (5)
I believe the answer is:
radar
'means of communication' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'in the war a daring' is the wordplay.
'in' indicates the answer is hidden within the clue.
'RADAR' can be found hidden inside 'war a daring'.
Can you help me to learn more?
(Other definitions for radar that I've seen before include "What shows range" , "System for locating distant objects" , "System that detects and locates distant objects" , "Measuring device that locates distant objects" , "Electronic detection system" .)