Was the mk1 Renault Clio Rsi ever fitted with an F3R engine?

No, the Mk1 Renault Clio RSi was not fitted with the F3R engine. Instead, it was equipped with the F7P engine, a 1.8-liter inline-four that produced around 110 hp. The F3R engine was typically used in other models, such as the Renault Laguna and some versions of the Clio II.