Crossword Genius

The sonar is working here (5,3)

Ross

I believe the answer is:

north sea

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'here' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'the sonar is working' is the wordplay.
'is working' is an anagram indicator.
'the'+'sonar'='thesonar'
'thesonar' is an anagram of 'NORTH SEA'.

Can you help me to learn more?

(Other definitions for north sea that I've seen before include "Area of natural gas" , "A great deal of water" , "Part of the Atlantic to the east of Great Britain" , "UK's source of oil, gas" , "Source of UK's oil/gas" .)

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