Good point gen2. Suggestion also from domtreff that it could also be 3 letters.
Unfortunately neither the 7 nor the three letter pattern suggests an obvious answer so I did a bit of thinking outside the box as it's the Skeleton crossword.
I think we have both interpreted domtreff'spost in different ways. You have taken it to be 7 or 3 letters and I took it to mean that there was some doubt about the first E and the word could end l-e instead of e-e.
I haven't seen a 'Skeleton' crossword since the 1960s when I used to treat it as a logic puzzle and complete the grid, then my father would do the cryptic solutions.