The most common and most likely answer to this crossword clue is the 5 letter word RADAR
I've seen this crossword clue in The Guardian
R
A
D
A
R
More clues leading to the result RADAR
- Actors relieved initially, finding system
- Run after players in training, locating kit
- Finding method actors, head for rehearsal
- Detector of bishop grabbing Lovelace?
- Detection equipment sub-standard?
- Two-way detection system
- Either way, it pings your location back
- Finding method that’s revolutionary
- Means to track sleigh’s progress going up and down?
- It’s used to spy planes going up and down
Buddy explains!
The straight part
We know that "detection system" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case detection system = radar.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does RADAR mean?
RADAR noun- A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of sent radio waves (usually microwaves) reflected from their surfaces
- A type of system using such method, differentiated by platform, configuration, frequency, power, and other technical attributes.
- An installation of such a system or of the transmitting and receiving apparatus.
- A superior ability to detect something.
- To scan with radar, or as if with radar.