I can't quite make this work. 13ac I have an "n" fourth letter which looks correct with 6dn and is 21dn but doesn't make the correct across word. What have I done wrong?
Old rifle was not missing fuel (6)? I am pretty sure that "fuel" is the definition and that I have the answer, but I am mystified by the wordplay. Any hints?
Helveticus, my reply assumed - rightly or wrongly - that you had the word for 'rifle'. If you don't, there's a two-letter word, meaning 'no', that can be inserted into the 'fuel'!