Crossword Genius

Oilfield found in London borough (5)

Ross

I believe the answer is:

brent

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'london borough' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for brent that I've seen before include "West London area" , "kind of 10 [GEESE]" , "Type of goose - London borough" , "West London borough" , "Small migratory goose" .)

I've seen this clue in The Guardian.
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