I take it we need to wait until someone at the Guardian wakes up and amends the submission form (at present suggesting 2 answers per clue).
How have others handled this?
All finished now, with the hidden name and the theme and the four undefined clues ... but where does the ambiguity come in? I realise that the "middle bit" could be ambiguous, but what alternatives are there to, presumably, 7 A/D and 20 A/D?
Oh, I almost get it. If you use the alternative for the "middle bit," you can change three of the intersecting down clues to fit that ... but where is the fifth?