Crossword Genius

Made useful contacts — indicating trawl was successful? (9)

Ross

I believe the answer is:

networked

'made useful contacts' is the definition.

I don't understand how the rest of the clue works.

(Other definitions for networked that I've seen before include "Joined up" , "made some business contacts" , "made good contacts" .)

I've seen this clue in The Times.
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