Crossword Genius

Monkey drops in West Country river (5)

Ross

I believe the answer is:

tamar

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'west country river' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tamar that I've seen before include "Devon-Cornwall boundary river" , "River of SW England" , "flower" , "woman who posed as a prostitute" , "Plymouth river" .)

I've seen this clue in The Telegraph.
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