Clue: Regularly using coercion, force on border flower (7)
Answer: ORINOCO
Explanation: Definition: border flower
[regularly using] (c)**O**(e)**R**(c)**I**(o)**N**(f)**O**(r)**C**(e)**O**(n) 
*The Orinoco is a river ("flower" (that which flows), some of which forms part of the border between Venezuela and Colombia.