Crossword Genius

River forded at Griffin Park (5)

Ross

I believe the answer is:

brent

I'm a little stuck... Click here to teach me more about this clue!

'forded at griffin park' is the definition.
I can't judge whether this definition defines the answer.

'river' is the wordplay.
I cannot really understand how this works, but
'river' could be 'r' (abbreviation) and 'r' is located in the answer.
The remaining letters 'bent' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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