Well, I have a full grid and the fifth word entered as necessary. However, as I had entered two down clues as if they were the right length I only had 12 answers too short for the required entry. That has taken me hours to spot my error and my brain is frazzled. So the final steps, i.e. identifying the pairings, therefore the down answer to be highlighted and drawing the relevant symbol will be tomorrows task. Still can't parse a couple even knowing the extra letter.