The
perimeter cells, reading clockwise from top left, spell out (with
reference to one unclued answer) what must be entered in the
central cell. Chambers Dictionary (2016) is recommended;
I copied that from the instructions.
Unless you have the crossword and the rather unusual grid in front of you it will be impossible to give saladdodger the slightest of hints!
I do, and even then have only just twigged that the message around the perimeter cells, which consist of letters removed from answers within the main section of the grid is a biblical reference!
You need to go to the text (chapter and verse is given by the perimeter dropped letters) and take first part of the instruction literally - luckily, it's a very short text.