Crossword Genius

Actors relieved initially, finding system (5)

Ross

I believe the answer is:

radar

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'system' is the definition.
(I have seen 'System of detection' mean 'radar' so perhaps 'system' could also mean 'radar')

'actors relieved initially' is the wordplay.
'actors' becomes 'rada' (I can't explain this - if you can you should give a lot more credence to this answer).
'initially' suggests taking the first letters.
The first letter of 'relieved' is 'r'.
'rada'+'r'='RADAR'

'finding' is the link.

Can you help me to learn more?

(Other definitions for radar that I've seen before include "one sends out signals" , "Method of detection" , "What shows range" , "Palindromic tracking system" , "Range and direction finding equipment" .)

I've seen this clue in The Times and The Sun.
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