Crossword Genius

Navigational aid both ways (5)

Ross

I believe the answer is:

radar

I believe this clue is a double definition.

'navigational aid' is the first definition.
(I've seen this before)

'both ways' is the second definition.

(Other definitions for radar that I've seen before include "Remote range sensor" , "Method for detecting distant planes, ships etc" , "Electronic detection system" , "Palindromic detection system" , "System of detection by echoes" .)

I've seen this clue in the Evening Standard.
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