Some of the clues must be modified prior to entry. In actual fact they have a word for "pass" removed from their wordplay before entry..
This may/may not be one of the above...
12a Short cut to the ground protects United fan (4) Grid entry is FU?L
possibilities FUEL/FULL?FURL
For this one I have the answer but can't parse...
14a Sure about embracing unknown older person in Elizabethan theatre? ...looks like SIGNEUR