The most common and most likely answer to this crossword clue is the 7 letter word ORINOCO
I've seen this crossword clue in Financial Times
O
R
I
N
O
C
O
More clues leading to the result ORINOCO
- Regularly used coercion, force, on foreign banker
- Venezuelan flower for womble
- Regularly dropping oars, I annoy cox endlessly leading us to river
- Gold coin tossed over river
- Gold coin forged — nothing for this banker
- Hunter getting a duck down, caught over river
- At home with old officer south of Yellow River
- Hunter mostly bearing north above Colorado river
- Operations Research used by popular old firm – flower of America
- One found on Wimbledon Common OR in Colombia, circling round
Buddy explains!
The straight part
We know that "river" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case river = orinoco.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.