It detects woman in Rolls-Royce (5)

I believe the answer is:

radar

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'it detects' is the definition.
The definition suggests a singular noun which matches the answer.

'woman in rolls-royce' is the wordplay.
'woman' becomes 'ada' ().
'in' indicates putting letters inside.
'rolls royce' becomes 'rr' (short for Rolls Royce).
'ada' placed into 'rr' is 'RADAR'.

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(Other definitions for radar that I've seen before include "Locator that uses a microwave echo" , "System for locating distant objects" , "System for detecting objects with radio waves" , "Electronic detection system" , "Navigational aid" .)

I've seen this clue in The Sun.

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