Force of Red River (5)

I believe the answer is:

drive

'force' is the definition.
(driving is a kind of forcing)

'of red river' is the wordplay.
'of' says the answer is hidden in the clue.
'DRIVE' is hidden within 'red river'.

(Other definitions for drive that I've seen before include "spin" , "Force into action, impel" , "Propel; outing" , "natural urge" , "Determination, ambition" .)

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