Very grateful for all help with these three clues please.
16ac: "Island capital - it's nothing as far as I'm concerned (3,4)." I have S-O,-O-E.
25dn: "They all stay to see the object (3-3)." I have N-N, -G-.
31dn: "Stocking filler, sweet but not tender (9,4)." I have C-O-O-A-E, -O-N.