Like the others I think the DOORJAMB is a poor clue.
It was the only possible answer but I'd never have got the double defn
And CASIO for watch??
ROLEX yes, TAG yes. OMEGA possibly
But CASIO ......?
On the other hand I will accept REFORM for party, just as I would accept NAZI, FASCIST, NF, BNP - they're all the same.