I think you have every chance, cockie.
I've had a change of heart, because this isn't a puzzle for general consumption and its audience is probably more eclectic than is typical, and perhaps less likely to enjoy the usual crossword shenanigans (moving letters around the grid, highlighting etc).
Having looked again at the 'Instructions', everything is fine if you've managed to fill the grid and you've made the obvious adjustment (leaving real words in that particular area).
The title simply operates as an additional mechanism (as crossword titles tend to do) for solvers who managed to fill the grid without fully solving the tricky clues for row 3. The reference to the title in the 'Instructions' gives solvers another chance to discover the subject - they should see the possibilty of 'Shelter' jumbled in row 5, remove it and spot the anagram in the residue (it's really quite generous of Nimrod, rather than an attempt to confuse or complicate what is, essentially, a reasonably straightforward exercise). And if anyone has missed the full significance of the silver zone - they've still got a completed entry to send in (Editorial genius!).