The Broad Index is a trade-weighted index used by the Federal Reserve to measure the performance of the US Dollar against a basket of 16 currencies. The central bank created the index as it was viewed that weighting in DXY overemphasized the Euro. The index is not traded, and thus does not carry a ticker symbol.
Yes, her can be an adjective if it is acting as a possessive pronoun. For example, She gave me her coat. Her is describing who's coat it is.
Clear coat is a bit different....clear coat covers in 1 coat no matter what (i coat may not look as good as 3 but it will be covered in 1)...it depends on how many coats of clear you want to put on your vehicle.