Am stuck on last two but, unfortunately, the last letter of one is the middle letter of the other - broad hints welcome:-)
6d My facetious Welsh manner (4) ?HE?
16a Glasgow jolly lively with cocaine inhaled )5) ?A?C?
I've looked up "jolly" in my Scots dictionary but it only gives two words (waulie and gawsie), neither of which match my letter pattern.